Nothing is known about Horsa's childhood. Seen as an stagnant, stoic giant, Horsa saw nothing but complete shock and scared looks from the public. With his actions, Horsa constructed a namesake for himself that the Order took notice and inducted him into the Zealots. Within the Order, Horsa built a reputation of reliability and was often seen to aid the Order member, The Lathe.
In his rounds, Horsa patrolled the area along the roads of northern Oxenefordscire. It was during one such patrol that he was targeted and then killed by the Viking Eivor, who was allied with the Hidden Ones. Afterwards, Eivor received a clue among Horsa's personal effects. The clue, mentioning the title, The Lathe, showed that Eivor needed to defeat the dice champion at the inn in Buckingham, in northern Oxenefordscire for further information of The Lathe's whereabouts.
- Like other Zealots, Horsa had unique fighting tactics and gadgets in his weaponry. Upon Eivor's instigation, Horsa wielded a Dane Axe, attacked with throwing spears, and defended himself with smoke bombs.
- For The Lathe, Horsa has the same clue as a chest at the Leah Villa Garrison.
- Most likely due to his size, Horsa travelled by foot rather than by horse like other Zealots, Hrothgar and Bercthun.
- In his cutscene in the Memory Corridor, Horsa's tone was neither defensive nor abrasive, but calm and appropriate. This seems to show that his title and reputation were just a mask he had to wear.