Once the text "STAGE 4" has appeared on the screen and Amul has started moving forward yet again, the stage's main theme will immediately start to be heard from the Yamaha YM-2151 as you'll come to three Dorlers that are spitting projectiles at you from their positions on the left side, in the centre, and on the right side of the screen; once you have dropped a bomb on each of these to kill them, ten Swallowtails will come flying towards you from the top of the screen. Once you have shot a Level-3 flame at each of these to kill them, three Koptera will come flying towards you from the right side of the screen - and once you have shot a Level-3 flame at each of these to kill them, you will come to a Red Egg on the left side of the screen. Once you have dropped a bomb on it to destroy it, a red orb with the Star of David on it will come flying out of it towards Amul; once you have collected this for the extra points, the first of the three "FIRE" rectangles in that bottom-right corner of the screen will (for a fifth time), be filled. You will then come to a Blue Egg on that right side of the screen - and once you have dropped a bomb on it, a blue orb with the Barbadian trident on it will come flying out of it towards Amul.
Once you have collected that blue orb for the extra points, a Sasori will come crawling towards you in the centre of the screen, while firing projectiles up to you; once you've dropped a bomb on him to kill him, five more Koptera will come flying towards you, from the right side of the screen. Once you have shot a Level-3 flame at each of these to kill them, five more Koptera will come flying towards you, from that right side of the screen - and once you have shot a Level-3 flame at each of them to kill them a Hari will start crawling away from you on the left side of the screen while firing his spines back at you. Once you have dropped a bomb on him to kill him, five more Koptera will come flying towards you from the right side of the screen; once you have shot a Level-3 flame at each of them to kill them, two more Koptera and a Zakato will come flying towards you from that left side of the screen (but much like its namesake from Xevious, if you do not kill that Zakato quickly enough, it will explode into eight pieces of shrapnel, which must be avoided). Once you have shot a Level-3 flame at each of them to kill them, two more Koptera and second Zakato will come flying towards you on the right side of the screen - and once you have shot a Level-3 flame at each of them to kill them, second Hari will start crawling away from you on the right side of the screen while firing his spines back at you. Once you have dropped a bomb on him to kill him, five more Koptera will come flying towards you from the right side of the screen; once you have shot a Level-3 flame at each of these ones to kill them, two Graia will come flying towards you from the right and left sides of the screen. Once you have shot a Level-3 flame at both of them to kill them, two more Hari (both of whom are flashing) will start crawling away from you on the left and right sides of the screen, while firing their spines back at you - and once you have dropped a bomb on both of them to kill them, they'll send two randomly-generated powerups flying towards Amul. Once you have collected them, they will both take their effects on Amul; two more Koptera and a third Zakato will then come flying towards you from that left side of the screen. Once you've shot a Level-3 flame at each of these three to kill them, a Pteranodon will come flying towards you from the left side of the screen - and once you have shot a Level-3 or Level-2 flame (or two Level-1 flames) at him to kill him, an Arijigoku will emerge from the ground in the centre of the screen, and fire a projectile at you. Once you have dropped a bomb on him to kill him, two more Hari (both of whom are flashing), will start crawling away from you in the centre of the screen, while firing their spines at you; once you have dropped a bomb on both of these ones to kill them, they will send two more randomly-generated powerups flying towards Amul. Once you've collected them, they will again both take their effects on Amul - and you will then come to another Red Egg in the centre of the screen. Once you have dropped a bomb on it to destroy it, another red orb with the Star of David on it will come flying out of it towards Amul; once you have collected it (again, for the extra points), the second of the three "FIRE" rectangles in the bottom-right corner of the screen will, (for a fifth time), be filled. Three more Graia will then come flying towards you, from the right side of the screen - and once you've shot a Level-3 flame at each of these three to kill them, four more Arijigoku will emerge from the ground on the left side of the screen, and fire four projectiles at you. Once you have dropped a bomb on each of them to kill them, a Hurricane (which is the second "indestructible" enemy of this game), will come winding towards you from that right side of the screen; once you have gone around it, a thirtieth Koptera (who is flashing) will come flying towards you from the right side of the screen. Once you've shot a Level-3 flame at him to kill him, he will send a fifth randomly-generated powerup flying towards Amul - and once you have collected it, it will once again take its effect on Amul. Another Pteranodon will then come flying towards you from that right side of the screen; once you have shot a Level-3 or Level-2 flame (or two Level-1 flames) at him to kill him, eight more Graia will come flying towards you, from that left side of the screen. Once you have shot a Level-3 flame at each of these to kill them, a third Pteranodon will come flying towards you from that left side of the screen - and once you've shot a Level-3 or Level-2 flame (or two Level-1 flames) at this third one to kill him, two more Arijigoku will emerge from the ground on that left side of the screen, and fire two projectiles at you. Once you have dropped a bomb on both of them to kill them, five more Koptera will come flying towards you on that right side of the screen; once you have shot a Level-3 flame at each of them to kill them, two more Sasori will come crawling towards you on the left and right sides of the screen while firing projectiles up to you. Once you have dropped a bomb upon both of them to kill them, a seventh Hari (who is flashing) will start crawling away from you in the centre of the screen while firing his spines back at you - and once you have dropped a bomb upon him to kill him, he will send a sixth randomly-generated powerup flying towards Amul. Once you've collected it, it will yet again take its effects on Amul; five more Koptera will then come flying towards you from the left side of the screen. Once you have shot a Level-3 flame at each of them to kill them, a second Hurricane will come winding towards you from the left side of the screen - and once you've gone around it, a fourth Sasori will come crawling towards you on that left side of the screen while firing projectiles up to you. Once you have dropped a bomb on it to kill it, a third Hurricane will come winding towards you from the right side of the screen; once you have gone around it, five more Koptera will come flying towards you, from that right side of the screen. Once you have shot a Level-3 flame at each of them to kill them a fourth Hurricane will come winding towards you from the left side of the screen - and once you have gone around this, two more Arijigoku will emerge from the ground upon the right side of the screen and fire two projectiles at you. Once you have dropped a bomb on both of them to kill them, you will come to a third Red Egg in the centre of the screen; once you've dropped a bomb on it to destroy it, a third red orb which has the Star of David on it will come flying out of it towards Amul. Once you've collected it (once again, for the extra points), the last of those three "FIRE" rectangles in the bottom-right corner of the screen will, (for a fifth time), be filled - and five more Koptera will then come flying towards you from the left side of the screen. Once you have shot a Level-3 flame at each of them to kill them three more Arijigoku will emerge from the ground on the left side of the screen, and fire three projectiles at you; once you've dropped a bomb on each of these to kill them, five more Koptera will come flying towards you from the right side of the screen. Once you have shot a Level-3 flame at each of them to kill them, six Gyaraga will come flying towards you from the left side of the screen - and once you have shot off a Level-3 flame at each of them to kill them, six more Gyaraga will come flying towards you from the left side of the screen. Once you have shot a Level-3 flame at each of them to kill them six more Gyaraga will come flying towards you from the right side of the screen; once you've shot off a Level-3 flame at each of them to kill them two more Hari (the eighth of whom is flashing) will start crawling away from you in the centre of the screen while firing their spines at you. Once you have dropped a bomb on both of these to kill them, the eighth one will send a seventh randomly-generated powerup flying towards Amul - and once you have collected it, it will (for a fifth time) take its effect on Amul. A fifth Hurricane will then come winding towards you from right side of the screen; once you've gone around this, a thirteenth Arijigoku will emerge from the ground in the centre of the screen and fire a projectile at you. Once you've dropped a bomb on this one to kill him a tenth Hari will start crawling away from you upon the left side of the screen while firing his spines back at you - and once you have dropped a bomb on him to kill him, six more Graia will come flying towards you from that right side of the screen. Once you have shot a Level-3 flame at each of these ones to kill them, two more Arijigoku will emerge from the ground upon the left and right sides of the screen and fire two projectiles at you; once you have dropped a bomb on both of them to kill them five more Koptera will come flying towards you from the left side of the screen. Once you have shot a Level-3 flame at each of them to kill them, you will come to twelve Tobo on the ground on the left side of the screen who are jumping into the air and flying towards you - and once you have shot a Level-3 flame at each of them to kill them, you will come to six more Tobo on the ground on the right side of the screen, who are jumping into the air and flying towards you. Once you have shot off Level-3 flame at each of these to kill them, five more Graia will come flying towards you from the right side of the screen; once you have shot a Level-3 flame at each of them to kill them you will come to fifteen more Tobo on the ground in the centre of the screen who are jumping into the air and flying towards you. Once you've shot a Level-3 flame at each of these to kill them, a sixty-first Koptera (who is flashing), will come flying towards you from the left side of the screen - and once you have shot a Level-3 flame at him to kill him, he will send an eighth randomly-generated powerup flying towards Amul. Once you have collected it, it will, for a sixth time, take its effect on Amul; you'll then come to twelve more Tobo on the ground on that left side of the screen, who are jumping into the air and flying towards you. Once you have shot a Level-3 flame at each of them to kill them, you will come up to six more Tobo on the ground on the right side of the screen, who are jumping into the air and flying towards you - and once you have shot a Level-3 flame at each of them to kill them, you'll come to three Skulls who are spitting projectiles at you from their positions in the centre of the screen. Once you have dropped a bomb on each of them to kill them, you will come to twenty more Tobo on the ground in the centre of the screen who are jumping into the air and flying towards you; once you have shot a Level-3 flame at each of them to kill them you will come up to two more Skulls who are spitting projectiles at you from their positions on the left side of the screen. Once you have dropped a bomb on both of these two to kill them ten Ghosts will materialize in front of you, and come flying towards you - and once you have shot a Level-3 flame at each of these to kill them, you will come to a sixth Skull who is spitting projectiles at you, from his position on that right side of the screen. Once you have dropped a bomb on him to kill him, you will come to seven more Tobo on the ground in the centre of the screen who are jumping into the air and flying towards you; once you have shot a Level-3 flame at each of these to kill them, eight Gaists will materialize in front of you, then start firing projectiles at you. Once you have shot a Level-3 flame at each of these to kill them, eight more Gaists will materialize in front of you, then start firing projectiles at you - and once you have shot a Level-3 flame at each of them to kill them, ten more Ghosts will materialize in front of you and come flying towards you. Once you've shot a Level-3 flame at each of them to kill them, you will come to a fourth Red Egg upon the left side of the screen; once you have dropped a bomb on it to destroy it a fourth red orb with the Star of David on it will come flying out of it towards Amul. Once you have collected it (for the extra points), the first of those three "FIRE" rectangles in the bottom-right corner of the screen will (for the sixth time), be filled - and five more Graia will then come flying towards you from that left side of the screen. Once you have shot a Level-3 flame at each of them to kill them, you will come to four more Skulls that are spitting projectiles at you, from their positions on the left and right sides of the screen; once you have dropped a bomb on each of them to kill them you will come to two more Blue Eggs and two more Red Eggs in the centre of the screen. Once you have dropped a bomb upon each of them to destroy them, two more blue orbs with the Barbados trident on them and two more red orbs with the Star of David on them will come flying out of them towards Amul - and once you've collected these (for the extra points), the second and third "FIRE" rectangles in the bottom-right corner of the screen will (for the sixth time) be filled. You will then come to three more Skulls who are spitting projectiles at you from their positions on the left side, in the centre of, and on the right side of the screen; once you have dropped a bomb on each of them to kill them, eight more Gaists will materialize in front of you and start firing projectiles at you. Once you have shot off a Level-3 flame at each of them to kill them, five more Graia will come flying towards you from the left side of the screen - and once you have shot a Level-3 flame at each of them to kill them, the main theme that you had been hearing from the Yamaha YM-2151 will fade out as Amul stops moving forward yet again.
The game's fourth boss theme will then start to be heard from the Yamaha YM-2151 as Death Guardian forms up in front of you; he attacks by randomly flying around the screen while spitting flames (they are similar to those that were shot by the Bio Cyclers in the second stage), at you, while occasionally splitting up as ten Ghosts materialize in front of Amul and come flying towards him (which, much like the twenty previous ones that you'd encountered in this stage, can be killed for 200 extra points apiece) before reforming in front of you. Once you have shot twelve of your own Level-3 flames (or eighteen of your own Level-2 flames, or thirty-six of your own Level-1 flames) at him, he'll explode - and Amul will now fly off the top of the screen as it fades out...