Players near the end of Act II of Baldur's Gate 3 will find themselves approaching the Thorm Mausoleum in the Shadow-Cursed lands. This quest can easily be picked up alongside the main quest Find Ketheric Thorm's Relic. The quest to Kill Raphael's Old Enemy is necessary to proceed with the main quest, as you need the Umbral Gem from Yurgir to complete the tasks in the Gauntlet of Shar.
Baldur's Gate 3: Kill Raphael's Old Enemy Quest Walkthrough
There are multiple ways to complete Baldur's Gate 3's Kill Raphael's Old Enemy quest. This walkthrough will explain everything in detail.