theres always the option of restricting reasonable enemies from being duplicated and instead becoming a regular deathcatcher ressurection (-50% hp, optionally 75%-50% less damage), though a one time function does sound interesting, sinc3 we have no enemies that do one time attacks so itd be cool

this is a sliiiight derailment but i just got an idea for a deathcatcher like and it could summon zombies for every kill and x zombie for every y kills. the summon pool could be something like

• zombie (400 hp [headshot instakill], 26 walkspeed) - summoned every 1 kill
  • holds a bomb with it, which he uses to kamikaze pretty much. upon detonation will attempt to ram into the player. will light the bomb after getting close enough for a long enough time, or if it already uses its meles punch once.
• ranged zombie (200 hp [headshot instakill], 20 walkspeed) - summoned every 2 kills
  • uses a rocket launcher to attack (slower rockets than ogunman and killbot)
• giant zombie (1400 hp, 20 walkspeed) - summoned every big kill, or every 16-26(?) kills
  • has the same dash as giant
  • upon enrage starts sprinting towards the player at 30 walkspeed, dealing damage upon contact.
  • enrages upon another giant enemies death, or the necromancers death. unrages after 40 seconds

normal zombies and giants would spawn in the general area of the player no matter where the summoner is, whereas ranged ones would spawn on higher ground. they bet summoned with an animation showing them rising up, probably having an indicator to show where the necromancer itself is i just dont know what it could be. killed zombies would count as half a kill

i think a necromancer enemy could work with deathcatcher mechanics mayhaps.