Your clan's mood indicates whether your people are happy with the leadership of the Clan Circle or not.
From best to worst, mood can be: jubilant, splendid, happy, contented, optimistic, reserved, worried, dissatisfied, gloomy, ugly, and grim. Any mood below reserved is bad.
A bad clan mood makes it harder to convince the clan to go along with the council's decisions, while a good mood makes it easier.
An especially low clan mood can trigger certain events, in which the people of the clan demand the circle change things.
Certain blessings, including Erissa's Hope, Gamari's Kumis and Hyalor's Law, can help the clan mood, as can the Entertain and Feast ventures and spirits such as the Butterfly. Additionally, emblem treasures will help the clan mood when their specific conditions are met.