Spectral guardian

Primary action. Provokes. Summons adjacent guardian (Range 5'). Duration: Indefinite Summons immobile guardian adjacent to you. Guardian attacks and crits on 16 (+0H). Does D6 holy damage. If you cast this again, the old guardian disappears and the new one appears where you place him. The guardian cannot be killed, but can be moved through. He is considered difficult terrain. He may attack once per round. He attacks the first creature to come in reach (a trigger action). The caster does trigger the spectral guardians attack but it will not attack as long as the caster moves out of range immediately after casting. Spectral Guardian gets an extra attack (only one extra per round) for anyone who passes through their square.