A_ImpXDeath1
From ZDoom Wiki
A_ImpXDeath1
(no parameters)
Clears the calling actor's SOLID flag and sets its FLOORCLIP and NOGRAVITY flags instead. Also sets the calling actor's special1 field to 666 to let the A_ImpExplode codepointer know to go to the XCrash state instead.
This codepointer is restricted to HereticImp and derived classes.
