No a group setting is totally fine.  Cooperation is name of the game for a sunbro.

But always be sure to really let an environment tell a story.  The characters are bringing light to a dead world that is always trying to kill them.  Make the tasks difficult, insurmountable, and rewards few and far between.

Every smile or sign of hope is only after climbing a mountain and slaying the mad beast upon it.

The character can only find joy in eachother as comrades at arms or tragic lovers set to battle and seeing eachother struggle fight and die over and over again.