The primalist has a skill called Maelstrom.
Within that Maelstrom skill tree, there is one sub-skill that gives “chance to cast Maelstrom on kill (5% per points)”.
When a kill triggers that maelstrom cast, we except that cast not to cost mana.
Indeed, otherwise, it is not called a “chance”.
unfortunately, it is costing mana each time it is proc.
In comparison, the Shaman has a passive : “chance to cast Maestrom when hit”. When that passive is triggered, the maestrom cast doesn’t cost any mana.
Another comparison : I have an idol with the affix : “2% chance to cast Maelstrom every 5 seconds.” When that idol triggers maelstrom, it doesn’t cost mana.
Can you please confirm if it is a bug or if those 3 behaviour are normal ?