Discovered this by pure chance. Perfect for even casual playthroughs if you somehow struggle against the final boss. The glitch functions as follows: you end your turn RIGHT AS you switch characters. Of course, you'll need to have recruited someone first for it to happen. This will create a state of limbo in the game's data, leaving the first character in the field, make them take damage like normal, EXCEPT if the attack doesn't kill you, it heals back to what your HP was when you ended the turn. It also counteracts most status effects: Shock, Weaken and (supposedly) Poison won't work. Lock, Freeze and Burn will work as intended, as they concern the dice rather than the equipment. Still unsure about Poison as I didn't get any poison enemy. Anyway, this still doesn't make the battle against Lady Luck the freest, but almost. Not really worth using against her during a speedrun though, unless you somehow get Rat King or Dryad with enough HP to resist all her attacks. Phase 2 can corrupt the setup too, but nothing major is you're quick enough (which means almost TAS level.)