you can't hit mobs with hands only with you're sword

Thanks for the report, this is a sneaky bug. It's actually a side effect from being struck by a weakness potion. Seems the effects are permanent. Try taking a strength potion. Sometimes that undoes it permanently.

Thanks for the report, this is a sneaky bug. It's actually a side effect from being struck by a weakness potion. Seems the effects are permanent. Try taking a strength potion. Sometimes that undoes it permanently.