Feudsm
Feudsm (sometimes spelled FeuDSM) is a portmanteau of feudalism and BDSM. Feudsm refers to a hierarchical structure of doms and subs in a BDSM group. It may either be a strict hierarchy, or it may include subinfeudation—a situation where anyone can be subservient to anyone, forming a complex web where the highest dom may also be sub to some lower members of the group.
The queen is definitely the top dominatrix of Deltarune's feudsm. She's in charge, and the only one who has cages.