A luminous fortress of interlocking silver-blue wards extends in a 30-foot Emanation from you and moves with you.
When you cast the spell, choose any number of creatures you can see as authorized. The citadel grants the following effects:
Protected Interior
Authorized creatures within the Emanation gain Half Cover and Resistance to damage from spells.
Denied Translation
Unauthorized creatures can’t teleport into or out of the Emanation. Attempts to summon creatures into it automatically fail unless made using a 9th-level spell.
Captured Magic
When an authorized creature within the Emanation succeeds on a saving throw against a spell, you can use your Reaction to capture part of that spell’s energy. Choose an authorized creature within the Emanation. It gains Temporary Hit Points equal to twice the triggering spell’s level plus your Intelligence modifier.
Sealed Threshold
The Emanation’s edge is Difficult Terrain for hostile creatures. A hostile creature entering it for the first time on a turn or starting its turn there must make a Charisma saving throw. On a failed save, it is pushed 15 feet away from you.
Vigilant Sight
Authorized creatures within the Emanation can see Invisible creatures and into the Ethereal Plane.
* - (iron dust)
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