This mob is WAY harder than it should be for conning green. It's a group mob but face rolled a group of 6 with lvl 27 being the lowest. 33 the highest.
When the chest despawns another chest spawns elsewhere. They don't have individual respawn timers. It seems that there may be a daily limit of chests per area as sometimes the cycle just breaks and no chests will spawn until the cycle resets at 6am (not sure whether the reset happens every day or every x days).
I was waiting till one more friend got this to post, but looks like that won't happen. I can confirm it exists. Necklace gives a +5% damage +5% healing buff Ward of the Ghaldassii, I didn't figure out exactly what type of damage yet if it's spell or physical or both, will report back once I do.
Anyone know what the key is to finding certain ones of these? I feel like they must have some sort of drop system in the game, where certain things drop certain runes more than others. I am Constantly finding Vitality runes from mid-teen-level humanoid mobs (moor'vaki, and lost orcs for example)