Phobos

Phobos is a boss from Final Fantasy V, it appears alongside Triton and Nereid when the player attempts to obtain the slab located in the Great Sea Trench.

Phobos is the poison-elemental member of the trio. Unlike the other two, Phobos is not undead.

Strategy
Similar to the Gargoyles, Triton, Nereid and Phobos must be eliminated at the same time, failure to do so will cause them to revive and retort with Delta Attack. The battle can be won easily by using Odin against them. The Magic Lamp can even be recharged nearby.