Which hero class has darkstorm?
None of them. Umberwolf (Ghulvania legendary) has that as its third trait.
Assassin does I believe
Classes with shadow tree can create a darkstorm at the start of the battle
Assassin, necromancer, orbweaver, sorcerer, and thief
Necromancer, Orbweaver, Sorceror, and Thief are other classes that can start the match with a Darkstorm. However, only Umberwolf has the permanent-Darkstorm ability.
Edit: oh, come on.
Ok thank you guys