You designate one target within 60 feet and speak aloud the true name of the beastly arth. The creature is summoned next to the target and attacks it immediately. Each subsequent round on your initiative the arth will attack the designated target to the best of its ability. After 1 minute it will vanish. The summoning cannot be dispelled and the arth cannot be banished for the duration of the spell.

If you lose concentration on this spell before 1 minute has elapsed the arth remains summoned but is no longer under your control. It rolls a new initiative for the remainder of the casting time and switches its target to you.