Last Light Inn
If the player reaches the Shadow-Cursed Lands through Grymforge, Branthos can be first encountered at the Last Light Inn, where he is patrolling the main plaza in front of the inn's entrance, as well as the underpass where Bex is.
After talking with Jaheira, Branthos, along with Elindale, Lassandra, Manus, and Skywin will move to the bridge in front of Last Light Inn, waiting for the player so they can move in to intercept and ambush a nearby Absolutist convoy in order to acquire their source of protection against the Shadow Curse. Accepting the mission would have Branthos and his squad of Harpers cast Light on their weapons, and move in to the Ruined Battlefield, where they'll lay in wait for the Absolutist convoy. The player can either go with the group immediately or catch up with them later, as the ambush site is marked on their map.
If the player immediately talks to Isobel and fight Marcus after talking with Jaheira, Branthos and his squad would already be on the bridge, out of reach of the battle.
Ambush
Talking to Branthos at the ambush site will commence the ambush and spawn in the encounter. Once the convoy arrives, the player has a choice to attack immediately or hang back. If the player chooses to stay hidden and keep watching, Kar'niss kills Brawler Vez, one of the goblins in the convoy. From there, the party can either signal the Harpers or the Harpers will start the encounter themselves. After the fight, on the drider's corpse will be a Moonlantern.
Alternatively, the player can convince Kar'niss to relinquish the Moonlantern, and to lead the Absolutist convoy to its death, where they will eventually be cursed. Either way, Branthos and his squad will then depart amiably, and return to Last Light Inn.
If the player chooses to reach the Shadow-Cursed Lands through the Mountain Pass route, a goblin greets them and sends the player to a rendezvous point to wait for their guide to Moonrise Towers, where the player will pass off as a True Soul. This starts Follow the Convoy.
Kar'niss, the guide, will ferry the player's party, as well as the rest of the convoy to Moonrise. During the trek, Branthos, along with Elindale, Manus, and Skywin will ambush the convoy. The player can choose to either turn on the convoy and help the Harpers, or protect the convoy in order to continue their cover as a True Soul.
If meeting the Harpers for the first time, Branthos will take the drider's Moonlantern and tell the party to head to Last Light Inn, where they can reacquire the same Moonlantern after speaking with Isobel. If the party sticks with the convoy, Branthos and his squad will turn hostile, and be killed.
After the Ambush
If sided with and alive, Branthos can later be found on the top floor of Last Light Inn, drinking wine with Elindale.
Assault Moonrise Towers
Branthos is killed during the fight against Absolute forces before the party can arrive. His corpse can be found in the Moonrise Towers Prison, surrounded by a Death Shepherd and a horde of Necromites.
Combat
Melee: 1.5 m / 5 ft 
Range: 9 m / 30 ft 
Loot
Notes
- Branthos wears a set of armor identical to the
Scale Mail armor set, but with metal kneecaps and the shoulder pads from the 
Scale Mail +2 set. He also has a 
Harp-Shaped Pin pinned on his chest. - If killed at any point in time during the convoy's ambush, either Elindale, Lassandra, Manus, or Skywin will take the lead in talking to the player instead and refer the latter to Last Light Inn.
- As of Patch 6, despite having Extra Attack, Branthos is not able to attack twice during his turns.
- Likewise, despite having Disarming Attack (Melee), Branthos is unable to use that action.