I have a campaign with a region of undead where the element of fire is so prevalent that it has become part of some of the monsters. That is, I have some fire-based property sets that I would like to apply to the zombies in this environment as you would apply a template (like Fiendish). The only problem is, I have no clue what kind of challenge rating modifier these property sets ought to have, let alone when applying combinations of these property sets. Can someone help me figure this out please?
These are the property sets (plus my own guess for challenge rating adjustment) specific to each fire-infused body part:
- Eyes: creature has permanent See Invisibility and +5 Spot. CR +1?
- Arms: creature has Slam attack with fire damage similar to the fire elemental's Burn ability (MM p98; S +1d4 fire dmg, M +1d6 fire dmg, etc). CR +1?
- Chest: any creature in a 5" radius of this creature takes nonlethal heat damage, any creature in a 10" radius of this creature when it dies takes lethal fire damage. the damage effect is similar to that of the fire elemental's Burn ability, except the damage is only taken when the Burn save fails. CR +2?
- Mouth: creature can spit fire similar to a permanent Fire Breath spell (CA p106). CR +1?
- Legs: creature's speed is doubled. CR +1?
applying any one of the property sets gives the creature the Fire subtype, elemental traits, immunity to fire, vulnerability to cold.