So, dark matter is purple?

In games at least, when it's there, it's purple (Dark/Evil takes black). Since that's not a colour that the other 'elements' lend themselves too (except maybe electricity - or evil fire).

Well, takes an Abyssal ship to appreciate an Abysmal taste.

Finally, they've got a place to send Hiei's and Isokaze's cooking to.

Warusame is already dead, being an abyssal and all, as such even items as destructive as Hieikaze's cooking would cease to affect her.