Unexpected Berserk Reference

I've finally got around to watching Ninjago: Dragons Rising (loving it btw), and I was quite surprised to see a reference to the manga Berserk in Season 2 Episode 9 "The Forest of Spirits." Said scene is when the evil God Hand first appeared in the Black Swordsman arc of Berserk, who like the Forbidden Five are beings that normally live in another dimension and can only cross over into regular reality through human sacrifices. Both the God Hand's home dimension & Nether-Space appear as a...