when I enter a bossfight  the ui bugs and i am un able to do attack or use magic. it only happens on bosses and im at the goliath so im just softlocked plus you cant use any battle items because the slider doesnt work.

If I recall correctly, that happens only if you use spacebar. It'll be fixed on the next build. In the meantime you can use the mouse, and I believe enter key also works fine.

no i have been using the mouse in fights the entire game and it still doesnt work. but enter key still works fine.