Ornn

Ashe perma-slows Ornn with Volley (W) plus Frost Shot autos. Volcanic Rupture (Q) terrain takes time to set up, Searing Charge (E) has no dash range, and Call of the Forge God (R) cannot reach her if she kites with her support.

Fiora's Riposte parries Searing Charge and stuns Ornn for the duration of the Brittle proc, cancelling the combo. Duelist's Dance vital procs deal true damage that ignores Ornn's stacked armor every few seconds,

Ornn cannot disengage from Flawless Duet (E) stun and has no answer to repeated Bladesurge (Q) resets through the wave. Volcanic Rupture (Q) terrain is sidestepped by Q dash, and Call of the Forge God (R) charge is interrupted by Vanguard's Edge (R) wall pin.

Counter Strike stuns him on top of Jax and Volcanic Rupture (Q) is the only ranged threat he has — Jax dodges Searing Charge (E) commit, stuns on the recast, and stacks Relentless Assault on a target with zero disengage past level 6.

Kayle's Starfire Spellblade on-hit deals percent-HP magic damage that ignores Ornn's armor stacking and scales past Doran's Shield regen. Divine Ascent ranged auto level at 11 outranges Volcanic Rupture's 800 cast range,

Volcanic Rupture (Q) and Bellows Breath (W) are both short-range — Rhaast's Reaping Slash (Q) max-HP damage chunks Ornn's tank HP through resistances, and Blade's Reach (W) knock-up cancels Searing Charge (E) commit. Call of the Forge God (R) cone is dodged by Shadow Step (E).

Kennen's Thundering Shuriken pokes Ornn from outside Volcanic Rupture's 800 cast range every few seconds, scaling past Doran's Shield regen. Electrical Surge stack detonation roots Ornn out of Searing Charge into Brittle commit,

Volcanic Rupture (Q) and Bellows Breath (W) both have wind-up frames Rumble can interrupt with The Equalizer (R) slow zone. The magic-damage kit ignores Ornn's armor stack from Living Forge, and Electro Harpoon (E) slows during his Searing Charge (E) wind-up.

Hijack copies Call of the Forge God and gives Sylas a two-cast long-range knock-up the moment he reaches level 6. He fires the first cast from fog of war, then knocks-up the same line again on recast, controlling the entire teamfight from outside his usual short range.

Teemo sits at auto-attack range and Toxic Shot poison chips Ornn's HP every wave, scaling past Doran's Shield regen. Blinding Dart denies Ornn's Living Forge auto-attack passive that procs his clear pattern,

Black Cleaver plus Crushing Blow (Q) armor shred deletes Ornn Living Forge passive masterwork resistances, so even when he survives the all-in his team-wide passive value drops. Warrior Trickster (W) breaks Call of the Forge God (R) ram target lock through the clone.