Keeper of Souls - Pegasus Island Boss Mob Not spawning

[Jindra]

Have to kill him to get Sirran the Lunatic to pop to do the turn-in for the key to the next Island...spent 3 days clearing the island, and waiting on his spawn timer to wind down, and he hasn't shown up yet...beyond frustrating...

[Osiris]

Ill take a look a this, however I can say that I have killed him many times...I have done the necro epic at least 4 times, to the point I have my PoS map full of annotated points. in addition to the necro epic, I have got elemental crowns for mage epic too

[Osiris]

update:

The Keeper of Souls has been killed recently, here is an excerpt from the kill log:

71075 = Keeper of Souls mod ID
71 = Plane Of Sky (airplane) zone ID

71075 - 71 - 2017-06-06 05:59:29 - Majibit
71075 - 71 - 2017-06-06 05:59:29 - Zirek
71075 - 71 - 2017-06-05 21:43:11 - Zirek
71075 - 71 - 2017-06-05 21:43:11 - Majibit

[Jindra]

But the most recent kill date shown there is on the 6th. Since then, I've cleared the island numerous times, and waited out the spawn timer ( waited until the other mobs on the island that I had killed started re-popping )without him spawning. Is he NOT a guaranteed spawn, albeit a timed one so that people can get their keys? According to Drexell's Guide, he's supposed to pop just over an hour from the time the first non-named mob on the island is killed.  If there's an additional spawn timer for him, how long is it?

[Osiris]

what triggers the KoS to spawn:


--after the first 'soul carrier' is killed, 200 seconds later a signal is sent to the Key Master script, and if another KoS trigger is not active the KoS trigger is now set to 'on' and will remain 'on' for 2 hours.
--that will then spawn the KoS in the following time frame -> (random time up to 25mins + 1hour)
--once spawned, the KoS will stay up for 30mins, after which the mob will depop if not killed before then.
--upon the death of KoS, Sirran is spawned.