The mastery known as "Deathfire Touch" has been possibly bugging out for me. I have tried with multiple champions yet not able to make the mastery work with passive abilities, this includes but is not limited to; Darius's Passive(Hemorrhage), Cassiopia's poison that is left affecting people, Teemo's E(Poison Shot), Twitch's Passive(Deadly Venom). I have tried numerous of times to get the mastery to work but it did not.
If the ability does not proc spell effects (i.e. Rylai's slow), it will not proc Deathfire Touch.
Darius' passive, Twitch's passive, and Teemo's E are all DoTs which are applied by basic attacks. As such, they do not apply spell-effects.
For comparison, the DoT from Fizz's W and Brand's passive are applied by abilities and as such apply spell effects.
Abilities which apply on-hit effects (i.e. Ezreal's Mystic Shot or Gangplank's Parrrley) will not apply spell effects.
Passive's are not abilities. Although hemorrhage will be damaging them with DFT assuming you hit them with a spell/ability.
