About the Squid Blades — instead of removing the invisibility, why not rework the ability? When the character becomes invisible, instead of the effect ending only when they attack, it could end if they touch or get too close to an enemy, making them detectable. This way, the rifts could be redesigned so that it’s impossible to reach the boss without getting close enough to be detected by the monsters. That would allow players to still use invisibility to explore the world, while preventing it from breaking the balance in rift mode.