Dependable (3.5e Trait)
From D&D Wiki
Your party can find you as a stone to base the party upon.
Benefit: if adjacent to an ally, you can choose to take an attack for them instead but it automatically hits.
Drawback: if you are adjacent to an ally and choose not to take a hit directed at them, you must make a will save DC 15+ your Character level not to try to take the hit that you decided not to take)
Roleplaying Ideas: You find yourself as being the foundation of the party. You will always rally the party aiding them, ending quarrels, or even getting a one up to make a situation easier for them.