- S Rank: +2 Agi & Int
- A Rank: +5 S.Ruin
- B Rank: +3 Mag
- Soul of the Warden
- Treu will quickly move around on one floor for 10-30 seconds. He will move to a different floor upon taking too much damage or being on that floor for too long. Caution is recommended upon reaching the highest floor as Treu often attacks with his fists as the player climbs on the ledge.
- Upon filling up his mana gauge, Treu will teleport out of sight and shoot 2-5 electric balls (depending on his remaining Hp) toward the player that explode a few seconds after being launched. After shooting the last ball, he will arrive and cause a thunderstrike at the center of whichever floor the player is currently on.
- After depleting 1/4, 1/2, and 3/4 of Treu's Hp, he will move to the center of the room and shoot lightning in 2, 3, and 4 directions respectively. It will circle counter-clockwise if the player is on the right side of the room, and clockwise if the player is on the left side. The player is unable to hide beneath or above the lightning as it shoots through platforms. To stop this phase, the player must hit Treu at least once with any attack.
When Reina abandoned her training at the northern Alagathian monastery, the monks were faced with a dilemma. The hundreds of souls they had prepared for the Golden Child ritual would soon dissipate if they didn't enter a suitable vessel. Though he was young, Treu, another orphan training at the monastery, was the next best potential candidate. He barely survived the ritual, but upon doing so he was granted the rank of High Commander.