about 2 months ago - EHG_Kain - Direct link

I’m not sure what node you might be referring to, sorry.

There’s “Spirit Shards”, which causes you to gain a spirit shard on hit up to a total of 13 shards. When you have 13 shards, your next harvest use consumes all shards to grant more damage, and mana.

So it’s not mana on hit, it’s shards on hit, and at full shards get mana when you use harvest.

There’s also the Chest affix - gain mana when you directly use harvest. That’s not on hit, you only get it once per skill use as it’s “on harvest use”