Megalith
Tier 2 Epic conjuration
Casting Time: 1 action
Range: 90 feet
Components: V, S, M (a fist-sized stone inscribed with druidic runes by seven different archdruids)
Duration: Concentration, up to 1 hour
You summon a mighty elemental being that appears in an unoccupied space you can see that is connected to the ground. The megalith disappears when it drops to 0 hit points or when the spell ends.
The megalith serves you unquestioningly and takes its turn immediately after yours. The megalith obeys verbal commands given to it in a language it understands (no action required by you). If you don’t issue commands to it, the megalith defends itself from hostile creatures, but otherwise takes no actions. If the megalith is within 90 feet of you, half of any damage you take (rounded up) is transferred to the megalith.
Ref: ELCR p98