Ninjago, Season 10: March of the Oni

Garmadon:
The Oni entered this realm through a portal or rift between our world and theirs. There are only one or two ways this is possible. And, I'm willing to wager, it would've been through the Realm Crystal. To stop this darkness from spreading, the crystal must be destroyed.

Zane:
The Realm Crystal is currently housed in the new high-security vault, below Borg Tower.

Nya:
That's smack in the middle of Ninjago City!

Kai:
Uh, we just escaped from there, remember? It's engulfed in a giant, black cloud of destruction, and now you're asking us to turn around and go back?

Garmadon:
I asked nothing. I am telling you that if you wish to stop the darkness, the crystal must be destroyed.

Cole:
And I'm telling you, forget it! Just one of those black cloud tentacle things touched my foot for a second, and nearly froze me solid! We wouldn't last a minute inside the darkness.

Garmadon:
That is correct. You are merely human. I, however, am Oni. I can enter the darkness, make my way to the crystal, and destroy it. I will, of course, require a weapon.

Cole:
Ha! Fat chance!

Lloyd:
Do you really expect us to just hand you a sword and let you go?

Garmadon:
If you wish to live, yes.

Lloyd:
Well, forget it! No way! I wouldn't trust you with a… a… a-

Kai:
A pillow! [Cole, Jay, Nya and Lloyd look at him disapprovingly] It's the most harmless thing I could think of.