To save Nere in Baldur's Gate 3, the main steps are:
- You need explosives (usually a Runepowder Vial) to clear the cave-in trapping Nere and some deep gnomes in Grymforge, part of the Underdark.
- Once you have the explosives, drop them next to the rubble and ignite them with a small ranged fire attack (like Fire Bolt) to blow the rubble and free Nere.
- Be aware that resting too long nearby will cause poison gas to kill Nere and the gnomes trapped with him. You need to act with limited rests before freeing him.
- After freeing him, Nere will emerge along with two gnomes but will immediately kill one of them. You then have a choice to side with Nere against the other factions, side with the opposing forces, or fight everyone.
- It is not possible to save all the gnomes trapped; one will die immediately when Nere is freed.
- The actions you take will influence your quest outcomes and possible rewards.
In summary, to save Nere: get the Runepowder Vial (explosives), use it to clear the rubble quickly, then decide how to handle the ensuing conflict.
If further details on how to obtain the Runepowder Vial or the exact location to deploy it are needed, additional info can be provided.
