This shit with the new damage classification is SO messy. Some skills do damage where they didn't before, some now do even if they shouldn't considering how they're classified etc...
EDIT: i fucking finally figured how it is supposed to work:
Spell piercing : if not, spell won't have ANY effects.
Spell piercing : if yes, spell will have effects but damage depend on the type.
This is not consistent with what they said (where they said that spell piercing don't actually block damage, bullshit it does), but it's the most consistent way to make it work ingame. The only problem is that some things change because of this. In general, if you want a spell to have pure damage and apply debuff, it will damage BkB users whereas before it didn't: example, Meat Hook now damage bkb/rage targets, howl of terror now apply debuffs even to bkb targets whereas before it didn't. If you want a spell to deal damage to a target (physical for example), it will have to pierce spell immunity or won't deal damage, example: crush now deal no damage anymore cause it don't stun so even if physical it deal 0 damage. Acid alche spray however now pierce bkb so it still deal damage as physical spell.
