Svarn is the Warchief of the Boar clan he has good health to substiute his lower attack and defense. He can also tame an animal (bear or wolf) which means it can move around and enter enemy territory and neutral territory because it can be controlled (if the Hvedrung skin is on the boar warchief can still do this).
Rig's Saga[ | ]
In mission 6 you encounter Svarn right after recruiting Liv he is being attacked by Boar Loyalists under Hvedrung and you must fight them off to win that level
In mission 7 you take control of Svarn and help him take down one of the 2 Jötunn in order to win the level
In mission 8, 10 and 11 Svarn is in the pool of Warchiefs to be picked for that mission and has his own dialogue for aspects of each of those missions
Cross of Vidar[ | ]
In mission 1 he along with the rest of rig's group help capture Hvedrung and go their separate ways when Surtr shows up
In mission 7 he helps Nominoë take over his part of Neustria.
In mission 8 he using his miners helps dig out one of the swords for the cross of Vidar
In mission 10 he is the first shoreline you must keep from falling