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mana leech also has to have the target with mana. Wraith mana leech actually goes off the targets mana, while the "hit mana leech" on weapons is not connected to anything due to the monster.
If your monster/target has no mana, then no mana for you.
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And it's a true leech, or so they say. Means it takes mana away from your target and gives it to you.