These demon plates were worn by the creature that first cursed our people with bloodlust. By the heroic act of one brave orc - he was defeated. Mannoroth the Destructor is no more. Let these plates always remind us of how far we've come and how hard we fought to regain our honor.
The Armor's Support
The tree the armor is attached to seems to be dead. This may be how it was originally, or it may be due to the fel radiation that may be present on the armor, due to Mannoroth's time wearing it.