Some of the abilities seem wrong.
Everything Stormbolt or Storm related is probably an ability of Thorim. You remember the huge storm giant with the big ass hammer (which crashed in an area called "Thunderfall", it doesn't get more obvious)?
Most fire and "smithing" related abilities are probably abilities of the Fire giant we saw (like Activate Construct, Devouring Flame and Grab). Same with frost abilities and Hodir.
Asteroid and Cosmic Smash might be abilities of Algalon, the living star constellation.
Yogg Saron also seems to come with
Aura of Despair considering
Saronite Vapors. There are also "Summon a Guardian of Yogg Saron from the ether" and "Spew bile at the enemy" spells.