To her surprise, her clothes started to dissolve right off of her body. (Patreon)

She tried to get out, but the walls of the cube kept her trapped, although she could move inside it. Her pants, then her vest, then her blouse were gone, and soon it had dissolved her underwear, too.  Her hands shot up to her head and she was pleased to realize that it didn’t seem to harm her hair. Yet. Her boots were taking longer to dissolve as well. 

 Fumbling for her sword, she finally tried slicing her way out. She could swing it freely, until it hit the walls of the cube. Then, it cut the surface as if she was cutting a piece of leather. As she created punctures, the gelatinous substance of the cube drained out, and she was able to extricate herself from the disgusting creature.