Luckily there are set locations this can be dropped.
Tail #1will target a healer soon after tidal wave. This should be dropped on Tile C (Back-right)
Tail #2Will target a DPS. This should be dropped on Centre tile if not cracked. If centre if cracked should instead drop the tail on Tile A (Front-Left)
Tail #3Will target a Tank during the dragonhead add phase. Drop on Tile D (back-left)
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Tail #1Healers always drop tail on Tile C
Tail #2DPS drop on mid (if no crack on mid) OR Tile A (if is a crack on mid)
Tail #3Tanks always drop on Tile D
“1” and “2” are helpful to callout which sides of tiles are safe from Ice Sickles
But are often unused if party is trained-up, or not on headsets