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If demons steal mana at the very beginning of the battle, how can Spiritual Bond be a late-game ability???
After all, the Necromancer hero must cast some spells.
Demons have weak defense, which means Spiritual Bond can generate a significant amount of mana (and quite quickly).
Meanwhile, the Necromancer's troops fight as usual.
Besides, you shouldn't get too carried away with raising the dead, because after 2-3 times, your troops will fall apart from a single touch.
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