Bone Cage (Divine Domain) in Tales of the Valiant

Heliana's Guide to Monster Hunting, pg. 499

Bone Cage (Divine Domain)

5th ring Divine, Necromancy

Casting Time: 1 action

Range/Area: Self (20-foot-radius sphere)

Components: V, S, M

Materials: (the bones of a non-animated corpse, which the spell consumes)

Duration: 1 minute

Attack/Save: Dexterity save

Damage/Effect: You draw the bones from all corpses within range, forming a carapace of ribcages and femurs.

You draw the bones from all corpses within range, forming a carapace of ribcages and femurs. You gain temporary hit points for each Small or larger corpse wholly or partly within range, according to its size, that last for the duration:

Size	Temporary HP Gained
Small	1d6+1
Medium	1d8+2
Large	1d10+5
Huge	1d12+12
Gargantuan	1d20+25

As an action on a subsequent turn, you can cause your armour of bones to erupt, expending all remaining temporary hit points. Each other creature within range must make a Dexterity saving throw, taking piercing damage equal to your expended temporary hit points on a failure, or half as much damage on a success. Whatever the manner in which the temporary hit points are lost, the bones shatter and can’t be used in this way again.

In higher rings: When you cast this spell using a spell slot of 6th level or higher, the radius of this spell increases by 10 feet for each slot level above 5th.

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