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PC EU
Keelsplitter was down to circa 3m health from 5m - at least 3 active players in the process of attacking the boss
3x keelsplitter re-set itself to full health.
Havnt tried it myself yet, but throwing a guess here, Keelspliter is one of this rare bosses that doesn't move/pursue attackers but stays in one of 3 set spots...they updated keelspliters melee attack range...i wonder if that is perhaps drawing the snake past its reset point..making it reset the fight?
Yup happens in one spot and did multiple times to me in exact same spot. Then it shuffled on the floor back to one of the other spots after the reset and as soon as it went back to that particular spot in its rotation, it reset. On PC EU, gave up after 4 attempts.