Skeleton Diver

The Skeleton Diver is a boss version of the Skeleton Spear appearing in Castlevania: Curse of Darkness. He is portrayed as the hunched-back skeletal remains of what appears to be a fisherman and is a master wielding the trident.

Castlevania: Curse of Darkness
When Hector enters the boss room in Mortvia Aqueduct, he'll be immediately presented with a long bridge he must cross, with the promise of a new Innocent Devil's room which can be seen on the other side. However, while stepping on the middle part of the bridge, this will suddenly crumble, sending him down to a circular platform at the bottom of the room surrounded by water.

The Skeleton Diver immediately makes his dramatic appearance, riding a gigantic skeletal fish and jumping high off of it to land over Hector, trying to impale him with his trident. When the battle properly starts, the player will immediately notice that it's not the best idea just trying to fight him head on, as his skillful combos will always give him the upper hand in a one-on-one fight. The hunch on his back, on the other hand, is his weak spot and if Hector manages to position himself behind him, the Diver will get staggered with each hit until he cowardly jumps back to the safety provided by the fish.

The fish won't just stare there while the fight goes on and it will in fact aid his master, becoming a major nuisance throughout the fight by performing two main attacks:
 * 1) It will come out of the water, perch itself on the shore and unleash a powerful laser beam which will cover most of the battlefield. The player should try to get to either of its sides (left side preferred) and attack the fish itself. All of this, of course, while fending off the Diver's relentless attacks too.
 * 2) The fish, this time ridden by the Diver, will emerge from the water and land on the ground. It will then start hopping on the surface, making his way to the other side while attempting to stomp on Hector while doing so.

The Skeleton Diver will also submerge underwater while riding the fish and perform one of two attacks: either trying to land on Hector with his trident or throwing a set of fire-infused tridents vertically, which will impale on the floor and remain there for a brief period of time.

His last attack is riding the fish again but this time circling around the arena while hurling three tridents at Hector. This is a good chance to attack him, though. Hector must perform single or double quick steps to avoid the tridents and, at the same time, trying to position himself on the fish's path to attack him while it passes in front of him. The swords' and hand-axes' second combo (two normal attacks followed by a final attack) is recommended for this purpose, as it sends the weapon flying forward in a boomerang-like pattern, while dealing continuous hits.

Stealing guide
When the fish emerges from the water and starts hopping on the ground, the Skeleton Diver (riding on its top) will open his stealing window. The player must carefully position in a spot to either side of the fish's path, leaving enough space to maneuver, lest they end up cornered; then jump and attempt to steal, taking care of not being knocked back while doing so.

Trivia

 * The Skeleton Diver wears an old and ragged cloak which gives him an appearance similar to Death.