It's the land bonus as was mentioned before

Quick guide:
just for example start in Halmvik.
1) Give a task to walk to Felgorn peak and summon the owl.
2) While your hero is walking towards Felgorn peak you give another task for your hero to go to a guild arena\house fighting pit. You open the tab with arena\fighting pit and wait your hero to summon the owl. boom. extra bonus from land.
Your arena\fighting pit can be anywhere so this will work for anybody.