Steelix is immune to Life Orb?

Question

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In this video on turn 4, my Steelix doesn't take Life Orb damage. That was it's held item.

Answer 1

Simple. Your Pokemon had Sheer Force

>If the user is holding a Life Orb and uses an attack that activates Sheer Force, it will not receive the 10% damage from Life Orb, but it gets boosts from both Life Orb and Sheer Force (total of 69% base power increase).

Proof.