Magistar
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The amount of damage the summoned creature will absorb depends on its level; with skilled summoning magic, it absorbs half the damage. And the strength of the shield depends on the amount of witchcraft used; the shield has hit points, and the more witchcraft used, the more hit points it has. All the damage absorbed by the shield reduces the shield's hit points. And as soon as it reaches zero, the shield disappears immediately.