"REAP SPIRIT, ETERNAL DARKNESS," after Soulayer entered [Enraged] mode as Stark tried to hit the jar between its neck, it suddenly activated two skills.
…
[Skill: Reap Spirit]
[Description:] Soulayer can harvest the souls of fallen foes to strengthen itself during battle, however there is a limit to that, and the backlash it receives can be very high if it uses too much power
…
[Skill: Eternal Darkness]
[Description:] Plunges the world into darkness, giving it an incredible advantage as it is used to fight in the dark because of the [Soul Graveyard] rift.
…
'Soul Graveyard…?' was what confused Stark the most, doesn't that mean this monster was in another much more powerful rift, yet came to this one and became a boss.
In the end, he didn't have the time to think too much about it since…
"REAP SPIRIT," Soulayer kneeled down, then put both of its arms inside of the black water.
~FWISH, FWISH~