If a guild in the Green world behaves too aggressively, it may be ostracized by other guilds. This will happen if the guild takes up arms in too many wars and/or if many guilds set a ‘Hostile’ standing towards this guild. The ostracized guild receives the status, ‘Derelicted’ and oblique line on a guild heraldry appears. If this guild has a Tier 1 monument, their monument and its Town Claim becomes vulnerable to any damage during Judgment Hours.
In other words, the Ostracism feature helps to neutralize overly aggressive guilds - it is a powerful instrument of Green world politics!