By far the most overpowered weapon in all of SLASH'EM, the Bat even outdoes many artifacts that are attacking their "hated" monsters. It certainly makes the rogue role much easier in SLASH'EM, combined with the other advantages they are given; a rogue's only goal in SLASH'EM's early game is almost certainly going to be to find an altar and sacrifice everything in sight. It makes the early game absurdly easy, felling most monsters in one or two hits, but one should always be careful not to be overconfident. The Bat does not make you invulnerable.