It seems the cowarding thingie (boss not spawning that time and just getting a message that "something frequents this area, but no sign of it now") seems to still be on Babylon.

I posted this to the improving forum first, as I wasn't sure was the thingie being removed from all bosses. It is pretty safe to say that no other boss has this thing anymore and Babylon is the only boss still having it.

I just tried to do the boss 3 times in one reset and it cowarded every time.

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Characters:
Elder Torsten Eadgarsson
"He’d only shown the best of intentions. Firm but not unreasonable. Eager to protect what was his but not eager to overextend his reach, to push himself on to others."

Today, at the Braxat Trophy Tender, I got the message 'The local leader doesn't want to face you right now. The coward!'. So he apparently has it as well.

Fixed the Braxat boss trigger for update to 5.15s

Fixed Babylon too.