The Tower of Druaga/Monsters

Druaga has spawned many monsters in his tower to defeat Gilgamesh, and Gil will need to fight them to progress. Should Gil touch one of them without his sword drawn, or come into contact with a spell fired by slimes or magicians, dragon or Sorceror's fire, he will lose a life. Though most generate with the level, the Will'o Wisps also appear when the bonus timer runs out and turns red.

Slimes
Slimes are very basic monsters. They move slowly around the maze, and will kill Gil if he touches one without his sword drawn or if a spell-casting slime's spells hit him (unless if blocked by his shield). Gil can kill any slime instantly if he crosses paths with one while his sword is drawn; however, it's still dangerous to cross a slime while it's moving towards you. Slimes are fairly predictable in that they will wobble just before they move.

Knights
Knights are the first enemies you will encounter that don't die in one hit. To defeat them, you must cross paths with them while your sword is drawn. They will kill Gil with one hit if his sword isn't out. You can inflict more damage by attacking from behind.

Beware of fighting multiple enemies at once! Gil has an invisible energy meter that depletes as he battles these enemies. If it runs out, he will die. The good news is, defeating each knight will recover Gil's energy by a certain value.

Magicians
Magicians will appear at a point at least two tiles away from where Gil is, cast a spell at him, then vanish. The spells will kill Gil instantly; however, he can defend himself by blocking them with his shield. He can also kill the magicians before they vanish, if he's quick enough.

Ghosts
Ghosts cannot kill Gil by touching him, which is just as well, seeing that he can't see them without a candle. They can kill Gil by casting spells at him, and they can also warp through the walls. An easy way to defeat a ghost is to wait for it to pass in front of you, then chase it with your sword drawn such that you continually inflict damage until it disappears.

Dragons
When Druaga split the Blue Crystal Rod into three, Quox, a dragon who was inhabiting the tower, was split into three as well. Dragons are very difficult to slay without special items. The player can pass into a dragon without dying if Gil's sword is not drawn. However, if your sword is drawn, they can finish you off (similar to knights and ropers). Additionally, they can breathe fire that will normally kill Gil unless the player obtains the Blue Necklace and destroy walls like Druids, Druid Ghosts, and Blue Slimes.

Will o' Wisps
These fly around the maze very fast and, as such, are difficult to avoid. Will o' Wisps will appear continually while the bonus timer is red, just to put the pressure on.

Ropers
Like dragons, ropers won't kill you if you don't draw your sword. However, they will also zap your energy down to 1 (except in FC version where they deal normal damage), making it impossible to fight them or any knights and dragons. If your sword is drawn, they can finish you off (similar to knights and dragons). By defeating a roper, Gil can regain some energy, however Gil must be holding Dragon Slayer or a stronger sword in order to defeat them (in arcade version only, in Famicom Gil can defeat them with any sword).

''Famicom version note: There are two more types of ropers, named All-Green Roper and All-Red Roper. Other than color, they are the same as other ropers.''