Executor, also known as Ixecrator or Druid, and not to be confused with the Druid of the same name, is an enemy in Final Fantasy V. It appears in the Solitary Temple in the third world, either in groups or alone.
The Executor is capable of using all four level-based Blue Magic spells, and will randomly use either Level 5 Death, Level 4 Graviga, or Level 2 Old on the entire party at the start of battle, then occasionally use Level 3 Flare on its second turn. It is advised to defeat the Executor quickly before it has a chance to attack, since it can appear in sets of three and quickly decimate a party if their levels are dividable by any of their level spells.
The enemy's name is a mistransliteration of Execrator. To execrate something is to detest and curse it, thus an execrator is something that curses, much like how the enemy curses the party with various level-based spells.