Guild Wars 2

What will happen when these traits meet?
• Earth: Stone heart – You cannot be critically hit while attuned to earth
• Strength: Burst Precision – Burst skills have an increased chance to critically hit ( Chance: 100%)

How/Will these cancel each other out?

100% x 0% = 0%

The attack always would have critted – if they could be critted – but they can’t.

Now it would be great if it made them do 0 damage, though that is unlikely. Going to be interesting to see how they go about getting these too work.

Immunity always trumps any amount of boosted bonus.
Now if it had said “ALWAYS crits” then we’d have a problem.

What happens when an unstoppable kill shot collides with an uncrittable elementalist?

Answer is it gets deflected and instagibs the nearby stealthed thief.

I would imagine its just a regular hit.