Reverser
From Ephinea PSO Wiki
Reverser is a healing Technique that revives fallen allies. It restores a nearby dead player to full HP and TP.
Unlike most other Techniques, it has only a single level which requires 150 MST to learn.
Reverser has a fairly slow cast time, and is especially slow compared to using a Moon Atomizer. However, like Resta, Reverser can be used thousands of times on a supply of Fluid-type items; this can keep a group of players alive almost indefinitely, as long as someone remains alive to cast it.