A cryptogram for you to solve

[Xestia]

I've decided to give you all a little cryptogram to solve. It will lead you to a chest with some iron armor, and a diamond block, and some other worthless stuff.

Here it is :)

MDR MPRLNKPR AN YKPARE AW MDR SRWMRP VG MDR NUAPLZ AW MDR UJU HVPZE

[Xestia]

Yeah you cheated.

Mr_Hole_Digger at least did it manually.

Bonus points for who can tell me the key.

[Xestia]

The key used to encrypt it.