Apparently OPPOSED_TO_LIFE is invalid for targeting, but I am unable to test interactions in arena.
Here's my updated code:
interaction_chosen
[INTERACTION:CHOSEN_ONE]
[I_SOURCE:DEITY]
[IS_USAGE_HINT:MAJOR_CURSE]--Dunno what to change to, hoping to avoid 'profaning temple'
[IS_HIST_STRING_1: chosen ]
[IS_HIST_STRING_2: to seek out and destroy the powers of evil]
[I_TARGET:A:CREATURE]
[IT_LOCATION:CONTEXT_CREATURE]
[IT_REQUIRES:CAN_LEARN]
[IT_REQUIRES:CAN_SPEAK]
[IT_FORBIDDEN:NOT_LIVING]
[IT_FORBIDDEN:OPPOSED_TO_LIFE]
[IT_CANNOT_HAVE_SYNDROME_CLASS:WERECURSE]
[IT_CANNOT_HAVE_SYNDROME_CLASS:VAMPCURSE]
[IT_CANNOT_HAVE_SYNDROME_CLASS:DISTURBANCE_CURSE]
[I_EFFECT:ADD_SYNDROME]
[IE_TARGET:A]
[IE_IMMEDIATE]
[IE_ARENA_NAME:Chosen One]
[SYNDROME]
[CE_DISPLAY_TILE:TILE:12:5:0:1:START:0]
[CE_DISPLAY_NAME:NAME:chosen one:chosen ones:heroic:START:0]
[CE_ADD_TAG:NO_SLEEP:NOFEAR:NOEXERT]--A hero is fearless and tireless!
[CE_CAN_DO_INTERACTION:START:0]
[CDI:ADV_NAME:Burn evil]
[CDI:INTERACTION:BURN EVIL]
[CDI:TARGET:A:LINE_OF_SIGHT]
[CDI:TARGET_RANGE:A:10]
[CDI:VERB:shine holy light:shines holy light:NA]
[CDI:TARGET_VERB:is set aflame:are set aflame]
[CDI:WAIT_PERIOD:10]
[INTERACTION:BURN_EVIL]
[I_TARGET:A:CREATURE]
[IT_LOCATION:CONTEXT_CREATURE]
IT_REQUIRES:OPPOSED_TO_LIFE
[IT_MANUAL_INPUT:target]
[I_EFFECT:ADD_SYNDROME]
[IE_TARGET:A]
[IE_IMMEDIATE]
[SYNDROME]
[CE_BODY_TRANSFORMATION:START:0]
[CE:CREATURE:FIRE_VICTIM_CREATURE:DEFAULT]
and
creature_reaction_custom
[OBJECT:CREATURE]
[CREATURE:FIRE_VICTIM_CREATURE]
[DESCRIPTION:The remains of a smitten evildoer]
[NAME:dying slag:dying slag:dying slag]
[CASTE_NAME:dying slag:dying slag:dying slag]
[CREATURE_TILE:'!'][COLOR:RED]
[BODY:BASIC_1PARTBODY_THOUGHT]
[MATERIAL:KINDLING]
[STATE_COLOR:ALL:RED]
[STATE_NAME_ADJ:ALL_SOLID:kindling]
[IGNITE_POINT:10000]
[BOILING_POINT:10000]
[HEATDAM_POINT:10000]
[MAT_FIXED_TEMP:10000]
[STATE_NAME:GAS:exploding gore]--Added after testing, to avoid "caught in burst of !"
[STATE_ADJ:GAS:exploding gore]
[TISSUE:KINDLING]
[TISSUE_NAME:kindling:NP]
[TISSUE_MATERIAL:LOCAL_CREATURE_MAT:KINDLING]
[TISSUE_MAT_STATE:SOLID]
[RELATIVE_THICKNESS:1]
[TISSUE_SHAPE:LAYER]
[TISSUE_LAYER:BY_CATEGORY:ALL:KINDLING]
[BODY_SIZE:0:0:70000]
[ITEMCORPSE:BAR:NO_SUBTYPE:ASH:NO_MATGLOSS]
EDIT: Spawning the victim creature on it's own has the following results:
-It bursts into flame immediately
-It explodes shortly after