have summoner transform into a creature that has rotting parts
CONNECTOR -> PART_THAT_FALLS
Connector is made from a material that melts/boils away around "9000" so tissue layer that material on that. The PART_THAT_FALLS have it made from bone so layer that with the BONE tissue
so when the summoner transforms into that creature it will have to remain transformed for about 500-1500 ticks (forgot the exact melt time) but when the creature transforms add an interaction through the syndrome that targets the "dropper" creature and RESURRECTs it
[INTERACTION:MAKE_CYBORG] --- Resurrects a dead unit into a cyborg
[I_SOURCE:CREATURE_ACTION]
[I_TARGET:A:CORPSE]
[IT_LOCATION:CONTEXT_ITEM]
[IT_MANUAL_INPUT:creature]
[IT_CANNOT_TARGET_IF_ALREADY_AFFECTED]
[IT_FORBIDDEN:NOT_LIVING]
[IT_AFFECTED_CREATURE:DWARF:MALE_NORMAL]
[IT_AFFECTED_CREATURE:DWARF:FEMALE_NORMAL]
[I_EFFECT:RESURRECT]
[IE_TARGET:A]
[IE_IMMEDIATE]
[IE_ARENA_NAME:Make Cyborg]
[SYNDROME]
[SYN_NAME:altered]
You can have the summoned dropper creature/caste have a CREATURE_CLASS and have that as the AFFECTED_CLASS so it only targets summonable material to resurrect and transform into other creatures.
Also Remember if you want it hostile right way have the resurrect give OPPOSED_TO_LIFE and NOT_LIVING make sure the summoner has the same tokens. But if you want the summons and summoner to hate all life and not kill each other, make the summon creature a part of the same creature by caste and make them all CRAZED.