Tips to Beat Mother Tree
Spear is great, constantly use the multiple attack in both directions to prevent the short range hit from the tree, followed by combos of light attack damages and if you’re confident, trigger the multiple hits using your heavy attack without jumping.
You could attach a damage output gem on your spear to make it good, use at least the green tier spear (crafted at the blacksmith).
Dodge the roots by dodging works for all but one of them. Where you should strafe left and right to avoid being hit multiple times.
When it spawns normal enemies, take care of them like how you would a normal stage and don’t rush. This is where you’ll probably get hit once or twice but don’t fret.