I'm not sure if this is current content, or long forgotten content, but does anyone know what the Key Master is for?

In the Lesse Adoroth deadlands, there is a Key Master (level 22 mage) usually guarded one or two Elite Bone Vindicators (level 16 beast). The vindicators appear to be powerhouse bodyguards with higher than normal health.

This would have been a challenging fight at that level. I asked some old-timer players in MP and in my guild, but no one seems to remember this mob.