Sorceror-Prophet Nalgrund:
Poison is what kills him. And ethereals can tie him up. A Terrorgheist's scream also has a good shot at damaging him.
Poison has to be spammed a lot, he still has a heap of wounds and a 4+ ward. And it's unlikely you'll kill him before he hits.
Ethereals maybe, but given this is Storm of Magic, the amount of spell deal rolling around will probably kill them before they become an issue. Amusing if you get some Cairn Wraiths locked in combat with the Destroyer though.
Yeah, the enhanced Destroyer is for SoM games only, so he can be zapped with Cataclysm Spells and, more importantly, both sides can take one.
No he can't, as I mentioned before nuke magic doesn't work, it only inflicts a random number of wounds (which he can save against). Assuming you take 'Dark Colossus' as an upgrade.
It's true both sides have access to one, but Chaos Dwarves can also get the same guy (minus the upgrade options) in their regular force. If both sides bring one they do cancel eachother out, neither is likely to break the other's save (and they can't Thunderstomp eachother either).
One thing that people forget is that Thunderstomp does not benefit from Special Rules, which include .... Flaming Attacks. So that Dragonhelm/Dragonbane Gem won't protect the character unless he's mounted. Just thought I should put that in.
Oooh...so yeah, it looks like Ethereals (which can be magic zapped, and also casting the magic blades spell from Fire or Metal gives him magic attacks) are just about the only thing aside from another Destroyer that can tarpit him.
Say the Destroyer is hit by a cannonball. S10 wounds on a 2+, the Destroyer's -1 makes that a 3+... and the upgrade has no effect.
No, because modifiers are cumulative in Fantasy. If they weren't, no rules would stack.
So, first of all, due to the Colossal Beast rule, the cannonball goes down to a 3+, as it wound normally wound on a 2+ (S10 versus T6).
Then, the hit suffers a further -1 to wound. So say you do roll a 3, it becomes a 2 and thus fails. You would have to roll a 4+, getting reduced to a 3, which is still a successful wound.
edit: I think it does require FAQ clarification, and I do think it is a bit OP if my reading is correct. Could be wrong, but yeah, wait for the FAQ (there are a lot of other confusing issues in the MA book besides this one, believe me).