The Flail or differint material made flails

a weapon crafted with a regular chain x1 or 2 or a blaze rod chain or other chains made out of different materials and a spiked core or ball or maybe the spiked core or ball can be crafted with 4 or 5 or 8 or 9 spikes/flail spikes or mace spikes, with a heavy core.

combat.

swing left and right then smash attack or regular swings or something different and similar to the mace or the attacks are random for example swing left then its a smash attack, smash attack again and swing right and swing right, swing left and it goes on.

enchantment ideas.

wind blast. defeating a mob causes a wind blast like or similar to or almost like the exploding enchantment in minecraft dungeons.

maybe the exploding enchantment.

fire spawn. a smash attack can cause or has a chance to cause fire spawning around where the core hit so blocks around the block that got hit will have fire spawn on them.

expanding. while the weapon attacks or swings the chains expand.