The ice giants of the north, have seen fit to call you a shield-brother against the ancient foes. Upon completion of casting the spell, the caster becomes entirely invisible from the perception of dragons. If, while in this imperceivable state, the caster successfully attacks a dragon; performing a total of damage equal to, or greater than the dragon’s CR: the caster may may force the dragon to expend one use of its legendary resistances. Once this attack is completed, the user remains invisible, yet not imperceivable— and successive attacks do not force a loss of a legendary resistance.
On a successful loss of a legendary resistance, the dragon must perform a DC 24 Constitution Saving Throw— or the spirit of an ice giant is summoned to the side of the caster; acting on its own initiative, and following the verbal commands of the caster.
* - (Five inspiration points.)
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