You create a crystal bulwark to protect a creature that the hostile spell is targeting. If the creature is casting a spell of 3rd level or lower, its spell hits the bulwark and is diffused and has no effect. If it is casting a spell of 4th level or higher, make an ability check using your spellcasting ability. The DC equals 10 + the spell's level. On a success, your bulwark was strong enough and faceted enough for the creature's spell to diffuse while attempting to pass through, it fails and has no effect. On a fail, the bulwark shatters into dust and the spell continues to it's intending target having it's full effect.
When protected by the crystal bulwark the creature being protected has advantage on saving throws against any spell that targets only the creature(not in an area of effect). In addition, if those being protected by the bulwark rolls a 20 for the save and the spell is 7th level or lower, the spell has no effect on you and instead targets the caster, using the slot level, spell save DC, attack bonus, and spellcasting ability of the caster.
The bulwark remains for just that attack then shatters into dust and vanishes
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the spell is blocked by the bulwark and has no effect if its level is less than or equal to the level of the spell slot you used.
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