>>723450520
Nechronica characters have 'Fetters' which represent their relationships. You have one for a personal item that your character values, one for each party member, and sometimes ones for important NPCs. These range from romantic interest to being protective to just hating someone. They're the things that keep your character stable.

Each Fetter has 4 dots, which represent how much Madness is on the Fetter. If a Fetter fills up (either because something bad happens to your character or because you were in combat too long or whatever) the PC enters a state of madness and is compelled to perform a certain action or take a penalty depending on which Fetter is full. These can range from breaking parts on the Fetter's target, refusing to move away from them, taking an AP penalty, hurting yourself, etc. If all Fetters are full your PC is Broken Hearted and effectively out of the combat. If a whole party is Broken Hearted then it's an immediate game over/party wipe.

It's not super deep but it's an elegant little deal all told.