Argo had tapped deeply into his Gluttony-related abilities while battling a relentless stream of S-Rank opponents.
Considering the number of powerful Sages he had confronted immediately after ascending to the Sage Rank, it was downright astonishing that he still drew breath. The battlefields he had left behind had become barren and inaccessible by regular Rankers.
Even his S-Rank mana core wasn't entirely stable, making his survival even more remarkable. His role as a vessel for the Demon Prince of Gluttony was instrumental in this extraordinary feat.
These logic-defying demonic powers facilitated rapid healing, helping him recover from wounds and renew lost energy and mana. Thanks to these incredible abilities and well-laid plans, he ultimately managed to reunite with Eren on the battlefield.