The Final Arbiter ( Sleepers Tomb ) Does Not Have Engage Message
 

Pretty minor but I am sure this is easy to add

The other two Golems in ST have engage messages ( Master of the Guard, The Progenitor ) so it can be safely assumed The Final Arbiter should to.

I show that he does have an engage message.

I can post my logs of getting it aggro and never seeing a yellow message

maybe i can get someone to fraps pulling it as well - but a yellow text does not go out like the others not sure why it your code shows it there

while on subject of raid mobs that probably should have yellow engage message:

Keeper of the Glades ( PoG mini ) does not have engage message

This one functions like the other mini -bosses in PoG ( has zone wide shout, has minions that are linked) but does not give yellow text like the others in the zone.

Well that's interesting.

From what I can tell, he also wasn't using his aggro, slay, or death messages.

Fixed, pending update