This came up in a recent battle, when my opponent fired his Lr Redeemer at my Avatar.
The Avatar's Molten body rule, states that the Avatar is immune to flamers and heavy flamers. This seems simple enough, as they are both specific weapons. But the FAQ makes this rule more vague by stating:
"Q. Is the Avatar immune to wounds caused by incinerators, inferno cannons and inferno pistols?
A. Yes, as they are all either melta or flame weapons under different names."
This implies that the Avatar is immune to any weapon that is described as being a 'flame' type weapon.
We decided as a house rule that the Avatar should be immune to flamestorm cannons.
Does anyone agree with this interpretation or if not, what weapons not listd in the codex or FAQ do you think the avatar is immune from (Warhound Inferno gun for example!).
Cheers.