User blog comment:GreenMoriyama/Izo, the Blizzard Prince/@comment-25235491-20160720135947/@comment-3391671-20160720211223

When you live out for more than a couple thousand years, and you've spent the half-millinium seeing your homeland being fought over by pety humans, was is there not to be sassy about? :D

What I like about the dynamic between Izo and Bolverk is that age difference you would usually see in many tales. Izo is the young, still somewhat naive yet respectful man, while Bolverk is the more aged, wise yet a bit sassy spirit. In League, you don't see that kind of interaction often or at all, do you? Which is why I do like playing arond with the quotes here and there.

Izo sees characters such as Florence and Belle as higher spirits just like Bolverk, so as much as he may want to criticize or comment on who they are, he feels he is not in the right position to make any say on them. In contrast, Bolverk already knows who these two are and jabs whatever thought comes to mind, disregarding some formalities "higher spirits" should have between each other.

Looking to what you say in how Bolverk is so scarce in Izo's kit, Bolverk makes a much more thematic impression in Izo's entirety than being a tool within his kit. He is critical to the lore and he is represented in the game during idle animations and taunts. It also helps avert Izo from wielding a magical blade... that is only a magical blade. If the lore doesn't mention so, the sword is not only the symbol of the Northern Gale, but it is also a remembrance of Bolverk's life-long partner who had sacrificed her life to save the clan: Boreas. Not much is known of Boreas, but imagine a feminine spirit of the icy mountain who was at one point human (to be precise, an Iceborn). She embodies the typical kind soul that makes a light contrast to Bolverk who looks at issue in more practical ways. You could say they were almost as close as lovers, but they never saw one another on top of the other. They saw eye-to-eye.

Boreas was the one who imbued the True Ice Blade with her ice magic, with Bolverk providing the means to keep the blade from freezing itself over. In simple words, Boreas provided the mystical powers while Bolverk secured its bond to the blade itself. Yet, after the clan fled into hiding, Boreas had created a veil to hide away the Northern Gale from the 's gaze, but doing so bore a burden on her over the years, until her own eventual death in trying to protect the village from Lissandra's latest attack...

Now enough story time. Hopefully, that explains much for lore. :3