Wolvers are my favorite monster in the game and I think they deserve more than a Teir 1 Snarbolax as a boss.

Thus we need Vog to be back along with Skolver. Skolver could be a more detailed and ice-like big version of an Alpha Frostfur. This would allow Skolver Armor users to have a use of their armor in a boss fight to their skill level, besides Royal Jelly/Jelly King and the Snarbolax.

Both are Teir 3 bosses, both are about 3-5 times the size of Alpha Wolvers
When you get to the room theres 2 party buttons.
You are allowed only 1 selection, One button spawns Vog; the other, Skolver.
Vog deals elemental damage, Skolver deals piercing damage.

The Strata could be a situation in which Vog and Skolver are fighting for territory (credit to Star). With Gun Puppies, Chromalisks and Gremlins tossed in for some variety.

Skolver Party Button:
An animation occurrs where Vog is defeated by Skolver and is tossed into some icicles before disappearing after death.
Skolver roar/howls at you and the fight begins.

Vog Party Button:
Skolver is defeated and is tossed into fire by Vog. Same death animation as above.
Vog roar/howls at you and the fight starts.

Just a thought but if they are legendary/divine beasts maybe they can talk? As in Vana's speech bubble?

Vog fight:
3 phases
Phase 1: Normal Alpha Wolver attacks with chance of fire per hit. Can spawn up to 2 Vog cubs/Ash Tails by barking.
Phase 2: Vog burrows undergound for an amount of time while 5 Vog cubs/Ash Tails attack you. After a certain amount of time, Vog pops out of the ground again and wherever he is, a pillar of fire, similar to the Fang of Vog charge attack, spawns Shadow fire within the radius and has a chance of fire to any knight within the radius. This attack is used occassionally and Vog only stays undergound when the phase starts, the other times he just goes under for about 5 seconds than comes back up. Water Globes can be used to extinguish fire.
Phase 3: Same as last phases except 4 Vog cubs/Ash Tails can spawn at a time. Also he has another attack. Vog backs away from the knights and charges an attack. Vog then pounces at a selected ktnight, indicated by a purple pillar of light, and chomps him/her until he/she is defeated. This attack can be similar to a Zombie lunge attack, but more wolver-like. It can also spawn Shadow fire in a circle around Vog and the trapped knight, preventing other knights from helping unless utilizing the Water Globes to extinguish the fire. If the knight breaks free, the fire is extinguished on its own. This attack can maybe have an animation where the knight struggles to break free. Also Vog wont attack quickly and instantly kill the knight. Vog will bite the knight every 5-7 seconds maybe, to ensure a chance of escape? To escape the knight will either have to attack Vog repeatedly, or, if in a party, the knight's teammates would have to attack Vog as well. If the knight trapped is attacked by Vog, there is no chance of fire applied. The knight trapped cannot be targeted or harmed by other Wolvers in the battle. The trapped knight takes less damage while trapped by Vog.

Skolver fight:
3Phases
Phase 1: Same as Vog but with a chance of freeze per hit and 2 Frostifurs by barking.
Phase 2: Same as Vog but instead of burrowing, Skolver encases itself in a pillar of ice and gradually heals over time while 5 Frostifurs attack the knights. Knights can break Skolver out of the ice to prevent it from healing. Once Skolver is fully healed or breaks out of the ice, It will attack the same as Phase 1 but can cause icicle spikes to appear randomly at a targeted area by burrowing under the ground, much like the Snarbolax, except these stay in the area. The Fire Globes, like the ones in Candlestick Keep, can melt the icicles. The icicles can also be shattered if attacked enough by the knights
Phase 3: Same as Vog except the pouncing attack has a chance to spawn icicles around Skolver and the trapped knight, preventing other knights to come to the rescue without utilizing the Fire Globes to melt the icicles. If the knight escapes, the icicles shatter/melt on their own. If the trapped knight is attacked by Skolver, no chance of freeze is applied. The trapped knight takes less damage while trapped by Vog.

In both fights, any Frostifurs/Vog cubs/Ash Tails drop hearts when defeated. They are guaranteed to drop one large heart in Phase 3 of the fights, as that is when Vog/Skolver does the pouncing attack.

The dying animation for Vog could be its fur falls off into ashes as it howls/roars before eventually turning entirely into ashes and disappearing.
The dying animation for Skolver could be it slowly turns into pure ice as it howls/roars then cracks and shatters, revealing a golden wolver spirit, much like the ones from the Wild Hunting Blade attacks. The Golden Wolver spirits appears for about a second or two, then dissipates into nothing.

The Giant tokens are colored accordingly and named appropriately.

The best prize from Vog tokens would be a Fang of Vog weapon for about 30 tokens (to be determined by difficulty of the boss in testing)
Best token prize from Skolver could be, a sword similar to Fang of Vog, but named uniquely. The sword could be called "Frost Bite" . (credit to Star) The charge could cause 4 icicle Pillars to appear around the player, damaging with split normal and piercing damage. Normal Hits could have good knockback and inflict freeze. Instead maybe have the sword do a charge similar to the Barbarous Thorn Blade, with a Phantasmal dark blue Skolver that bites forward and can inflict freeze. (with good knockback/rang of course.)

Other Token obtained Items could include:
Special accessories such as Vog Wolver Tail and Skolver Wolver Tail. I'd like to see some of those in the game. Maybe like...

Drab/Regal Wolver Tail: 15-20 tokens

Cool/Toasty Wolver Tail: 30-40 tokens

(OPTIONAL)Divine/Volcanic Wolver Tail: 60-70 tokens

This way the really rare ones stay rare and the normally rare ones are at least possible to get.
Also for the Drab, Regal, Cool and Toasty ones, make them unbound!

That way they are rare due to how hard it is to get them, but not common enough to crash their market value upon release.
A Vog and Skolver themed shield. Come up with designs and post if you like.

Do NOT reccomend Skolver and Vog Cub Armor and helm as a rare drop from Vog and Skolver. I'd say MAYBE for a Token Item, but by then you'd probably already have the armor set in order to defeat the bosses. Also adding them as Token Items could potentially reduce their value. Ask some of the philosophers of the economy of Spiral Knights on that question.

Whew took me awhile to finish this so I hope this receives some positive posts. Any additions to this are appreciated as long as you give a reason.
Don't make the fight impossible guys, I did my best to make limits and base the fights off other bosses. When I simulated the battle in my head, it seemed about as hard as Vanaduke, if not a tad bit harder (especially when soloing). If you actually break down the Vanaduke fight, it sounds harder than it is.

Also after some posts further down, I think that a simultaneous fight with both Vog and Skolver would be a bit OP. For example they could both use their pounce attack and kill you twice as fast. Even If that was fixed, there are many other ways this would be hard, such as Shadow fire spawning around you while standing next to a Fire Globe. Overall it would be like fighting 2 giant Teir 3 Alpha Wolvers. Try soloing that :P

EDIT:
Perhaps make Skolver a normal Tier 3 boss, and Vog the Shadow Lair version of it. I only say Skolver should be Normal Tier 3 because Vanaduke already is the fire boss there, so It would feel probably repetitive for knights to go through more fire.

If not the idea of that, sustain the original thought and add the option for both in the Shadow Lair and Normal Tier 3, but still merge the levels so you fight Vog Cubs and Frostifurs at the same time.

~Xylka

/y Wolvers Forever!