Does the third strike on Jax's Grandmaster's Might passive trigger the Deathfire Touch keystone?
League-of-legends – Does Jax’s Grandmaster’s Might passive trigger Deathfire Touch
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Best Answer
Jax's Grandmaster's Might passive does trigger Deathfire Touch.
I have not tested this myself (I might later and edit to confirm), but the wiki provides information as to why this is so.
On the Deathfire Touch page:
Now we know Deathfire Touch is a spell effect, but does Grandmaster's Might passive count as ability damage? Yes.
On the spell effect page:
And on the Jax page under Grandmaster's Might (click show ability details):
Grandmaster's Might passive grants an on-hit effect of extra damage on every third basic attack in 2.5 seconds. Since this on-hit effect is classed as ability damage, it will apply spell effects and therefore Deathfire Touch.
I think it is safe to assume that, as @Gnarly 404 stated in the comments for @Eumel's answer, "[...] everything that triggers a Luden's Echo or Liandry's will also trigger Deathfire Touch." A quick look at some other abilities listed on the spell effect wiki page, such as Gragas's Drunken Rage and Kassadin's Nether Blade, confirms that this is probably the case. I did not check all of them, so feel free to prove me wrong.