After 100 Rebirths
From rebirth 101 it's harder: Raid Marks, Rift Fragments, stones, a raid boss, a Tower floor. Every 10 rebirths is a tier: a closed zone and +5 skill enchant.
From rebirth 101 it's harder: Raid Marks, Rift Fragments, stones, a raid boss, a Tower floor. Every 10 rebirths is a tier: a closed zone and +5 skill enchant.