
Passive
Living Forge
Ornn gains an additional bonus Armor and Magic Resist from all sources. Ornn can spend gold to forge non-consumable items anywhere. Additionally, he can create masterwork items for himself and for his allies.

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Riot Data Dragon 16.20.1. Base values before items, runes and bonuses; independent of match-data filters.
Base-game reference only. Mode-specific balance changes and augments are not included.
Official short descriptions · Data Dragon 16.20.1
Base-game reference only. Item, rune and mode-specific adjustments are not included.
This reference covers the passive and four ability slots. Alternate forms and full damage calculations are not covered.

Passive
Ornn gains an additional bonus Armor and Magic Resist from all sources. Ornn can spend gold to forge non-consumable items anywhere. Additionally, he can create masterwork items for himself and for his allies.

Q
Ornn slams the ground, sending out a fissure dealing damage and slowing enemies hit. After a small delay, a magma pillar forms at the end location.
Base values from ability rank 1 upward.

W
Ornn advances, breathing fire. Enemies hit by the final gout of flame become Brittle.
Base values from ability rank 1 upward.

E
Ornn charges, dealing damage to enemies he passes through. If Ornn collides with terrain while charging, the impact creates a shockwave around him which deals damage and knocks up enemies.
Base values from ability rank 1 upward.

R
Ornn summons a massive elemental at a location which travels toward him with increasing speed. Enemies run over by the elemental take damage, are slowed and are made Brittle. Ornn can recast the ability to charge into the elemental, redirecting it in the direction he hits it, causing the elemental to affect any enemies it runs over to be knocked up, dealing the same damage and re-applying Brittle.
Base values from ability rank 1 upward.