that buff only lasts 20 seconds, if you empower it you can make it 30 seconds, and it wont last 20 seconds if the monster is too strong, it will take less time, sometimes when there are like 5 monsters around you, it just stays there for like 5 seconds and it wastes some good mana, like 40 sp per buff, its maybe a little too much, that skill they could maybe change, dunno ... tho i dont think clerics are god because of it, the skill has its weakness, but i still think the other classes are too weak...
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