The atonement is when is when the hero is fully changed into their new self. They have accepted that this is who they are and have fully become the hero. The atonement also gives the hero a boon. This is a gift that can be anythinh from becoming a leader to being to spiritually enlightened.
The atonement for Shrek is when the dragon eats Farquaad and then he kisses Fiona. This kiss seals Fiona into her ogre form. This was "true loves" kiss, which shows that Shrek has truly changed into someone that can love and be loved.
The atonement for Shrek is when the dragon eats Farquaad and then he kisses Fiona. This kiss seals Fiona into her ogre form. This was "true loves" kiss, which shows that Shrek has truly changed into someone that can love and be loved.