I was thinking the idea of having a specialization inspired by Gerald from Rivia saga. Its a short range Witcher (melee) that drinks a black flask and becomes extremely agile, also has sign based magic that can block, push back, etc. Witchers, in this saga, have strong regeneration abilities and are known for being indifferent to feelings. Other things that they do during the story is enchanting the sword with elements and magic.

So the idea is to create a melee witcher with speed buffs, defensive and cc magic, and a strong health regeneration passive ability.