Donut's cloak, whose steadily rising Constitution boost Carl argues is an enhancement, not a base stat.
Princess Donut pins her hopes of regaining party leadership on this cloak: her Constitution still has several more spots to tick up before it hits the top because of it, and when it does, she claims she'll be back in control.
Carl shuts that down. Leadership is based off base stats, and the cloak's own description is pretty clear that the wearer loses its benefits over time if it's removed — which by his reading makes the Constitution buff an enhancement rather than base. Donut retorts that she doesn't even know what that means and it sounds like he's making it up.
Worn continuously by Donut, its benefits accruing over time while equipped and decaying if removed.
The item at the center of the argument over whether Donut can reclaim party leadership.