"Casting spells of another element" mechanic

[Llama8]

@stebobibo

Sun & Storms gives ward from fire and lightning spells, and the cooldown isn’t shared. I specialized fireball with the passive “plasma ball”, giving it lightning damage. Would I trigger ward from both fire and lightning with one cast of fireball?

I believe so, yes.

@stebobibo

What about when using elemental nova? It counts as all elements, so would it trigger Sun & Storms in the same way?

Yes.

@stebobibo

Dragon Mage and Dragon Breath: what happens when I cast a spell with 2 or 3 elements?

If you cast an unspec’d Ele Nova (ie, has all 4 tags), you’d proc & benefit from all 3 bonuses on Dragon Mage/Breath.

@stebobibo

Does a skill only count as being a “fire skill” or a “cold skill” if it starts as that or a passive in its tree makes it that?

Only if it has the fire/cold/etc tag when you cast it. What it was originally is irrelevant.

@stebobibo

What about idols that add elemental damage, like the “of cooling” affix? Would all my spells be considered cold when I have that idol? Thank you!

No, that just adds flat damage, the tags are the important thing.