Phantasy Star 3: I *love* the Force Vest.
Example use of this:
In one battle, the following happened (everybody was running low on HP at the start):
Lyle and Lena got killed
Mieu casts Nasak, and it decides to work, killing her (and healing Rhys and Wren)
Rhys and Wren finish the battle.
Result: Rhys and Wren are at high HP, everyone else is dead.
Enter the Force Vest. By having Mieu (who is dead, but the game doesn't care) use the Force Vest on each dead character until it decides to work, I can revive the dead characters, with full HP, for free. Hence, Mieu, Lyle and Lena are back to full health.
Worth noting: If I didn't have the Force Vest:
* I would have healed before hand, which costs TP (every healing spell costs 5 TP in this game)
* I would not have used Nasak (which costs only 1 TP, but kills the caster if it succeeds)
* Reviving (Rever technique) would require 5 TP per attempt, and it can fail.
Having the Force Vest means I don't need to fear death, and also means that I don't need to worry about Nasak's side effect of killing the caster.
Now, I just need a Royal Vest (free Nasak that never fails) and my 0TP healing strategy will be complete. (Another Force Vest wouldn't hurt either, and neither would a Force Shield (restores 50 HP) for that matter.)