Deltis

Deltis is a Bashai from Nihil's Throne, the loyal bodyguard of Sola Nox and the current leader of the Royal Knights. He first appears in the Lunar Fall arc to negotiate a ceasefire in Eastern Cloudream in exchange for the Starry Forest League's cooperation with capturing Luna Nox. He often describes himself to be not as strong compared to Edgar or Oculus but is involved with Nihil's Throne intelligence network. He has the ability to rapidly swap his mask to show his current expression.

## Lunar Fall

He has supposedly kept an eye on Sola Nox ever since she secretly escaped from the castle and surprised her when he appeared before her in Grace City. He was introduced as a Bashai diplomat who wanted to form a ceasefire agreement with the Starry Forest League, stating his master's sudden change towards the treatment of humans. He initially questions Arua's disguise but does not blow her cover and instead decides to take advantage of the situation, by mocking Arua whenever he could. Questioned by Toru on his authenticity, he reaffirms that he is a Bashai bounded by the SinForce of Honor and would follow his master to his death; even if she is an idiot. He insists that he is not a threat by stating that he is weaker compared to Edgar and Oculus and offers a special Sanctum Stone with the ability to directly warp to the castle in Nihil's Throne. The Grace forces accept his offer and tells the SoulWorker unit to deal with the SoulDreg Queen.

Deltis comes alongside the SoulWorker unit to explain the details of Edgar and Sola Nox and leds them towards Edgar. After the group fails to capture Luna Nox, Deltis has a secret conversation with Arua and the two discuss their current situtation. Arua is angered when Deltis calls her by Sola and orders him to only refer to her as "Arua" and not Sola. After some development in Nihil's Throne, Deltis returns to Nihil Throne in order to deal with an unexpected problem and asks if Arua intends to stay in Grace City. Arua insists that she would stay in Grace City as she is enjoying human food as prisoner and would prefer not to leave.

## West War

Deltis makes a return in the West War arc after the Grace forces receives reinforcements from NED Company and Eastern Cloudream. He offers the Western forces, Nihil's Throne's intelligence and offers to find Phlema for the alliance. In his encounter with Phlema, Phlema decides to intervene directly to stop his bodyguards from attacking Deltis, stating that they are no match for him. Deltis tells Phlema that he wishes for him to stop killing the Grace forces who promptly refuses. Deltis questions Phlema's behavior that if Phlema decides to attack then the eight SoulWorkers would attack him, putting Phlema in a bad situtation since he is currently recovering. Phlema laughs at Deltis's demands, stating that he has already recovered and was ordered by Kant to use a suicidal attack to destroy the Grace Tower. After hearing that Phlema no longer has much time left to live, Deltis gives Phlema an offer to duel with instead, stating that the former has nothing to lose and that it would be exciting to go down in a battle instead. Phlema accepts his offer and Deltis returns to Grace City to tell the group of their results.

After Phlema's death, Deltis congratulates the SoulWorkers but tells them that something urgent has occurred in Nihil's Throne and that he must return. He goes and retrieves Arua who initially refuses to return to the kingdom: accusing the SoulWorkers of selling her to Nihil's Throne. However, after Deltis informs Arua of the situation, she appears to calm down and is willing to go with Deltis. He states that after the issue has been settled, he would return to assist with the SoulWorker unit.