Gentlemen, I was under the impression that names were used as part of the rules many times for special abilities, upgrades and assignment of Special Characters (like the Phoenix Lords). you don't use a Special Rule to determine who a Tactical Marine is, it's in the name and the names make it so clear that it seems foolish to ignore it for determining who a Daemon is.
you may think my post is nonsense but I don't feel it is any more so than the "Fire Dragons" suggestion which is utterly hypothetical.
VikingScott wrote:Could this also work on gargantuan creatures like for example Ang'grath?
that is the fellow that featured in Imperial Armour 7 yes? I believ he is bested by Inquisitor Lord Hector Rex who used a weapon the wounds Daemons on a 4+, seems like it does affect them.