In the name of Greater Good, my Lawful Good character sacrificed an Avoral Guardinal. This happened in Occipitus (layer 507 of the Abyss), which he now controls as its Demon Lord. My character has gained the power to make a wish (in game terms, cast the wish Spell) and is going to use it to bring this Avoral back and atone for his action.
I know wishes are tricky, so how should I conduct the wish so that it doesnt have unexpected negative results in this case? (Loss of levels or Constitution are not that much of a problem, but side effects like loss of memory or identity, or inability to flee the plane for any reason, would be.)
After Yaztromo's suggestion I talked to my DM who said that it's ok to use the wish spell and that it will probably work for this particular Outsider if cast on Occipitus and is phrased correctly. DM also said that he is following AD&D rules for wishes.
Any ideas as to how to avoid messing up?