The Wing of Madoola/Stage 15
 A multitude of warps
This stage has, by far, the most complicated systems of warp doors, which is to be expected from the second to last stage, and there isn't a whole lot to distinguish one component of the stage from another. A map will certainly help. Every item in this stage is worth seeking, including the Spring of Strength behind door B. Reaching the doors that contain each item is the real challenge. Nyurus appear in large quantities in this stage, so you must still proceed with caution.
 Recommended route
Start out by heading to the left. Climb up the ladder and enter warp door W1. Upon warping, immediately climb down and back up the other side to warp door W4. You'll appear just to the left of door A where you can collect a Magic Book. Watch out for the Spajyan and Nyuru who guard this area. After you collect the book, return through W4 and W1 to the starting point. Now head back to the right (watch out for the Joyraima that might appear by the starting point,) and climb up the right ladder. Nyurus will begin to descend upon Lucia. When it is safe, access warp door W2. Upon warping, immediately climb down and back up the other side to warp door W5 (watch out for more Nyurus).
Once you appear from W5, simply walk to the left (watch out for a Suneisa) and climb up the first ladder that you find to discover the much needed Spring of Strength. Once your health is fully restored, exit and cross over to door C to collect the third and final Shield Ball. Then exit and continue to the left to W6. Upon warping, walk to the left. Skip the first ladder and climb up the second ladder to door E. Collect the jar and exit back out (you can return to the Spring of Strength at this point if you like to immediately benefit from the Jar.) Walk below the W6, beyond to the right and up to W7.
When you warp, head to the right to door D. Enter to fight the boss, collect the stage Ball, and exit. Watch out for the Hop Eggs that hang around door D. Return back to the left to warp door W7. (You can return to the spring through W6 if you feel that it's necessary.) From W7, walk to the right. When you reach warp door W8, you may be attacked by a large number of Nyurus and Eyemons, but you can actually use W8 as a way to escape from them all. Then immediately warp back through W8 and proceed right to the exit. As with Stage 13, you can hang out just outside the exit and attack Nyurus for a while, with the hopes of collecting orange and purple potions to boost your maximum MP and HP before you advance
 Boss: Byforce
This boss fight is fairly identical to your first fight with Byforce in Stage 12. In fact, having had a chance to visit the Spring of Strength and restore your health, it should be a lot easier. You will be able to tolerate a lot more hits, and therefore attack Byforce more directly. And if you take too much damage, you can always visit the spring again afterwards.