Most players will get level 1, as levels 2 through 5 only increase the HP and MP the target gets after being resurrected.
Although higher levels will allow the caster to resurrect two players at once, it would require a skill dye, and is generally considered not worth the skill points.
The reagent required for this skill, Jewel of Life, costs 15 . This can be prohibitively expensive to the Eir player. As such, it is customary for the resurrected player to refund the caster with 15 , or a Jewel of Life, at the end of the stage.