Phoenix Mountain Cave is a Hogwarts Legacy dungeon in the Poidsear Coast region of the latest video game developed by Avalanche Software for PlayStation 5, Nintendo Switch, PlayStation 4, Xbox Series X & S, Xbox One, and PC.
The Phoenix Mountain Cave in Hogwarts Legacy features two Collection Chests youβll have to find if you aim to achieve 100% completion in the Poidsear Coast area. Because these Chests are far better than the regular ones scattered worldwide, youβll most likely want to find them when you reach this dungeon.
Where To Find the Phoenix Mountain Cave Dungeon Collection Chests in Hogwarts Legacy
The Phoenix Mountain Cave is found on the northern side of the Poidsear Coast region, as you can see on the following map.

The cave is located northeast of Poidsear Castle Floo Flame. Chronologically, the Phoenix Mountain Cave is reached while playing the side quest named Phoenix Rising, so I recommend entering the dungeon while tracking the said quest.
Thatβs because while working on finding the Phoenix for the Phoenix Rising side-quest, you can also retrieve the two Collection Treasure Chests. If you miss them during the first visit, you can return to the dungeon via the Phoenix Mountain Cave Floo Flame at the entrance.
Collection Chest #1: Behind a Spider Web
For the first Phoenix Mountain Cave Collection Chest, after you enter the dungeon, follow the linear path ahead and destroy the wooden planks by casting Depulso. Jump over the gap and the two small wooden walls, then on the right side, youβll see a tunnel blocked by spider webs. Burn them with Confringo, then destroy the stone wall with Depulso.
Continue following the tunnel ahead (northwest), and youβll find another entrance blocked by a spider web. On the right side, youβll see a warning sign: Beware Spiders. Burn the net on the left side of the sign; then, while crawling through the hole, you should be able to spot the first Hogwarts Legacy Chest in the Phoenix Mountain Cave behind another spider web. Next to it, as you can see below, are some cocoons youβll need to destroy.

Collection Chest #2: In a Side Tunnel
For the second Phoenix Cave collectible, youβll have to progress through the whole dungeon. If you need help navigating the Phoenix Cave, refer to my Phoenix Rising walkthrough.
As you explore the dungeon, youβll eventually reach a larger cave where youβll have to deal with many Poachers. This cave is the last one youβll have to clear before finding the Phoenix, so basically, the Collection Chest is close to the exit point.
After you deal with the Poachers, take your time scanning the large cave using Revelio. The Collection Chest is found in a small side tunnel on the southeastern side of the large cave.

To get to the chest, youβll have to burn another spider web. Once you find this chest, follow the main path, and in the next section, youβll find the Phoenix you need to capture using your Nab-Sack.