SMT5 Challenge Run True Final Boss: Lucifer
1Here we are at the end of the run.
Phase 1: Honestly fairly easy it's just a bit of a puzzle as he resists almost everything until he summons the stars then he will have an elemental weakness while they are active. It's not too hard and phase 1 is the only phase you'll have to deal with if you choose law or chaos route.
Phase 2: He says screw the puzzles you just fight him straight up and he has Gaea rage, that really scary attack demi fiend has. Thankfully he doesn't have much for resistances.
Phase 3: at first it seems like phase 1 but then he incorporates higher level spells and Morning Star. A guaranteed instakill on the entire party but you can break the morning star before he gets to use it and he is weak to the 4 base elements if you want to shred him down or break the star it's up to you... but good lord I should not have won that fight.