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if spell drains 50 and unit has 45, I think it'd be best to not "touch" those units.
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I will update the filters to make sure that the unit has enough mana to be affected by the spell!
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if the hero has a certain item called Moonchant Gem, the spell should update to cause heroes, ally or enemy, to drop two orbs instead of one.
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So if the Caster has the item, only HEROES will drop two orbs?