Originally Posted by Mogrim
fiddles drain is not DoT. DoT is like ignite or malzahars malefic visions and even they stop when fizz uses trickster so that means that fiddle has a bug
It is a DoT. I think it even applies a debuff, but it's both a leash and a DoT regardless. Moreover, just like for Vlad's pool, ignite and malefic vision DO continue to do damage while you're untargetable. It's not like Zhonya's Hourglass. You're not invincibl, you just can't have anything nw applied.
I've gotten kills against vlads with ignite when they pooled.