The four Hidden Halos in Sailor Piece are pickups tied to the second Divine Trial, the quest line that evolves the Angel race into Archangel. All four sit on Sea 2 islands, spawn on a timer, and can be collected in any order once the trial is active.
Quick answer: The four Hidden Halos are on Sea 2 Starter Island (hill next to the teleporter), Bizarre Island (hill beside the World Boss arena), Punch Island (rooftops across from the Quest 23 NPC), and Blue Planet Island (second hill along the right coastline from spawn). They respawn on a timer in fixed spots, so server hop if a location is empty.

Requirements before collecting Hidden Halos
The Halos do not register until the Divine Trials 2 quest is active. To reach that point, you need Sea 2 access and the Angel race equipped, then talk to the Celestial Guide NPC on Blue Planet Island to start the questline. The first Divine Trial asks for five Secret-rarity drops; the Halo hunt is the second trial.
Picking up a Halo only counts once per location. Grabbing the same spawn twice does not progress the quest, so all four must come from four different islands.
Halo locations in Sailor Piece (Sea 2)
| Halo | Island | Exact spot |
|---|---|---|
| Halo 1 | Starter Island (Sea 2) | On the hill directly next to the teleporter where you spawn in. |
| Halo 2 | Bizarre Island | From the teleporter, head right toward the World Boss arena. The Halo sits on the hill beside the arena, not inside it. |
| Halo 3 | Punch Island | Take the left street from spawn until you reach the Quest 23 NPC. Turn around and jump onto the buildings opposite him; the Halo is on the rooftop behind the red building on the left. |
| Halo 4 | Blue Planet Island | From the spawn point, hug the right side along the ocean. Pass the first hill and continue to the second hill, where the Halo is tucked along the coastline. |
Blue Planet Island is the same island as the Celestial Guide NPC, which makes it a natural last stop before turning the trial in.

How Halo respawns work
Halo spawn points are fixed; they never move between locations. What changes is whether a Halo is currently spawned. If you arrive and the pickup is missing, it usually means another player on the same server grabbed it recently, or the spawn cycle has not refreshed yet.
The fastest workaround is server hopping. Rejoining a fresh server resets which spawns are active for you, so checking the same four spots across two or three servers will normally clear the trial faster than waiting in place.

How to confirm the trial is complete
Each Halo you pick up updates the Divine Trial 2 counter on your quest tracker. Once the counter reads 4/4, return to the Celestial Guide on Blue Planet Island. The NPC moves you on to the third trial, which is the Boss Halo farm.
If a pickup does not advance the counter, you almost certainly grabbed a Halo from a location you already credited. Move to one of the remaining three islands instead of recollecting the same spawn.

What comes after the four Hidden Halos
The third Divine Trial requires three Boss Halos, each tied to a pair of bosses so you can pick the route that suits your build:
| Boss Halo | Boss options |
|---|---|
| Patience Halo | Atomic Boss (Lawless Island, Sea 1) or Strongest Shinobi (Ninja Island, Sea 1) |
| Charity Halo | Cosmic Being or Sun God |
| Diligence Halo | Spirit Warrior (Blue Planet Island) or The World (Bizarre Island) |
Drops are not guaranteed, so a luck-focused build shortens the farm. Once all three Boss Halos are in your inventory, returning to the Celestial Guide evolves Angel into the Secret-rarity Archangel race and closes out the questline.