The Chimera Ending is an Ending in Prisoners of the Elder One. It occurs after talking to "Ebony" and "Ivory" three times without the warding crystal in Erik's inventory.
The more time Erik spends with "Ebony" and "Ivory", the hornier he gets, until he finally propositions them for sex. They accept, fucking each other for an unusually long time, before Erik dies from the exhaustion. When he wakes, he finds his body turned into a chimera girl, bound to the girls under the threat of 'scrapping her for spare parts'. Even though "Ebony" and "Ivory" help rescue Tiffany, they keep Erik as their chimera pet.