Critical effects:
	attack.c:
		update damtypecausescriteffects()
		update criticalhit()
			put replacements for similar damage types at the top
	lf.c:
		update injure() with special effects for bp_head
	text.c:
		update getinjuryname()
		update getinjurydesc()

	... then implement effects for f_injury bp_xxx dt_xxx