Hand of Fate 2

You will need to complete Veles' quest line fully to unlock his platinum companion card. None of the encounters are particularly challenging until you get to the final Brimstone encounter, Lysa Hora.

In order to progress in this encounter, you must first feed Veles 200 health units to get his own Brimstone transformation. You will then fight 3 consecutive battles against Shadow creatures. The battles progressively increase in difficulty, with higher ranking Shadows. There is no chance to heal in between battles, so unless you have a healing artefact (which you probably used to satisfy Veles' hunger anyway) you'll have to manage health wisely.

Remember that light weapons work best against Shadows. The roll mechanic can be pretty badly abused in combat if you don't feel safe with a head-on approach. Roll out of the way, especially when the enemy goes into blood madness. Always activate your companion's LB ability when it recharges. Always revive your companion when he goes down. Doing this can whittle down your opponent significantly. Once the third battle concludes, you'll win the token. When it cracks open, the achievement should unlock and your new platinum companion is available.