Mordenkainen's Faithful Phantom Guardian

This spell summons a faithful phantom being to watch over and protect the wizard for one day. The guardian will remain an undetectable observer, watching the caster from the Ethereal Plane. The guardian can see what is happening within 60 feet of the caster, and can spot invisible, out-of-phase, duo-dimensional, ethereal, or astral creatures within the area around the wizard. If the guardian spies any creature about to launch a surprise attack on the caster, it will instantly materialize to defend the wizard. The guardian fights for up to one round per level of the caster or until it is destroyed.

The wizard also has the option of summoning the guardian to his side at any time. The guardian will appear in one round and fight under the same time limit. Once the guardian has spent its time on the Prime Material Plane, it has completed its mission and will no longer watch over the caster. The guardian appears as a shimmering outline of violet light. The phantom guardian cannot speak, so it cannot shout a warning if the wizard is attacked.

The material component is a 1,000 gp diamond, which is sent to the guardian when the spell is cast as a payment for its service.

Notes: Uncommon or rare spell (WoG).

Faithful Phantom Guardian: AC 2; MV 15; HD 6; hp 36; #AT 1; Dmg 1d10 (two-handed sword); THAC0 13; AL N; SA can strike creatures hit only by +2 magical weapons.