The Dead Ends is yet another error in the push to make everything hardcore

[Packetdancer]

4. No boss in The Dead Ends uses an Exaflare.

Leaving aside the high probability of this being YATT (Yet Another Troll Thread), this part actually isn't true. The first boss drops puddles of Yuck which are then blown across the arena by wind, traveling either north or south from their original position; though the direction of movement is indicated visually by wind rather than by the usual arrows on the AoE indicators, the mechanic is still functionally an exoflare in any way that matters.