The Ancient Altar is a recurring point of interest scattered through the Tainted Forest zones inside the Cursed Swamps biome in Windrose. Each altar looks like a tall, masked humanoid statue draped in robes, with a stone bowl carved with imagery of a hunter presenting spices. Solving one is short, but the swamp's plague mechanic and the hostile mobs around every altar make preparation matter more than the puzzle itself.
Quick answer: Kill the Plague enemies surrounding the altar, collect 5 Mysterious Spices, then interact with the altar and choose Lay down an offering.

What the Ancient Altar requires
The altar's offering prompt asks for "ancient spices," but no item with that exact name exists in the game. The correct item is Mysterious Spices, which the offering option consumes from your inventory in a stack of five.
Spices carry over between altars. If you cleared enemies near a previous altar and kept the drops, those count toward the next offering, so you do not need to farm a fresh batch each time.
| Detail | Value |
|---|---|
| Biome | Cursed Swamps (Tainted Forest zones) |
| Required item | Mysterious Spices x5 |
| Interaction prompt | Lay down an offering (5 ancient spices) |
| Environmental hazard | Wood Plague gauge fills on entry |
| Recommended gear | Sun Ring (Major) |

Prepare for the Wood Plague before approaching
The Tainted Forest is identifiable by trees coated in orange, bulbous growths. The moment you cross into one of these zones, the Wood Plague gauge starts climbing on its own, and a full meter results in an instant kill.
Equipping the Sun Ring (Major) slows how quickly the gauge fills, which is the cleanest way to handle altars that sit deep inside infected terrain. If you do not have the ring yet, the alternative is to step out of the Tainted Forest periodically to reset the meter, then return to continue clearing enemies.

Collecting Mysterious Spices
Mysterious Spices drop from the Plague enemies that patrol each altar's territory. The pack composition typically includes:
- Plague Thrall
- Plague Warrior
- Plague Witch
Wiping the group around a single altar generally produces more than the five spices needed. Loot the bodies before approaching the statue, since the offering option only appears once the count in your inventory reaches the threshold.

Making the offering
Step 1: Walk up to the Ancient Altar with at least 5 Mysterious Spices in your inventory and press the interact prompt to examine it.
Step 2: Read through the inspection text until the offering option appears.
Step 3: Select Lay down an offering (5 ancient spices). The five Mysterious Spices are removed from your inventory, and the puzzle resolves immediately.

Rewards and what to do with the mask
Completing one altar grants 50 XP and the Gold Mask of the Priest, a Legendary-rarity item with no functional use beyond resale. The mask sells for 5 Guineas to the Smugglers of Port Royal buyer, the same faction tied to the Smugglers questline. Multiple altars exist on a single Cursed Swamps island, so a full sweep can stack up several masks in one trip.
How to confirm it worked
The interaction closes, the Mysterious Spices counter drops by five, and the Gold Mask of the Priest enters your inventory alongside the XP gain. If the offering option does not appear when you examine the altar, you are short on Mysterious Spices, check the inventory count rather than re-engaging enemies that may have already despawned their drops.