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That has to be wulfrik
Based on his words for his faction i think their will a "hunt" mechanic where perhaps you will be rewarded if you kill monsters or high tier units/lord characters or perhaps you are rewarded with more exp/loot if you either fight or defeat armies in battles where the balance of power is not in your favor
EDIT:
From: https://www.totalwar.com/Norsca/
Norsca: a barren, inhospitable peninsula to the north of the Old World. Here dwell ferocious tribes of warriors, hardened by the relentless blizzards, the icy tundra and the monstrous denizens of this accursed land. Fanatical servants of the dark gods, they will stop at nothing to prove their primal might, in a relentless hunt for worthy foes and fresh raiding grounds.
The Old World beckons, ripe for the plunder. Will you heed its call?
The Norsca Race Pack adds two new playable factions to Total War™: WARHAMMER®, with new Legendary Lords, unique units, quests and mechanics:
Choose one of two epic Legendary Lords, with unique start positions and quest chains, to lead your campaign:
Wulfrik, the wanderer without fear. Only the deadliest prey will sate his lust for the hunt.
Throgg, the mountainous Troll King. Possessed of an intelligence rare in his vile kind, he is hell-bent on bringing the frigid horrors of Norsca to the world.
Embark on brand new ‘Monster Hunt’ quests and subjugate unique, deadly quarries, forcing them to fight among your ranks.
Command brand new units such as monstrous War Mammoths, savage Skinwolves and the mysterious Fimir to bring your foes to heel.
Construct monoliths to honour the ancient dark gods, and receive their blessings to further your conquest.
Chaos pride' s going worldwide, baby! 
