The Witcher 3: Blood And Wine - 11 Easter Eggs, Secrets & References You Must Find
5. Dark Souls Bonfire (Dark Souls)
CD Projekt RED are no strangers to paying tribute to FromSoftware or the mighty Dark Souls, as even the previous expansion, Hearts of Stone, featured a battle against The Caretaker, a creature who appeared and battled you out of nowhere, just like various boss characters do in both Dark Souls and Bloodborne.
For this egg, be on the lookout for a cave entrance after you've vaulted the leftmost railing when facing the castle after defeating the Cloud Giant boss. Therein is the very iconic bonfire prevalent throughout those games. Geralt can not only kindle the flame with his Igni spell, but you can then pluck the sword out the embers to take with you.
Thanks to VG247 for the info, it's called Geshaft, does 627 base damage and increases Sign intensity by 20% across all spells. Praise the sun!