The Covenant Of Steel: Progression Mech Isekai

He has died over 3,000 times trying to save what he loved, and every single time, he has failed. Lieutenant Altair has been trapped in a death loop for as long as he can remember. From fighting the Precursors, to watching his homeworld fall, losing his comrades, and losing Elena, his fiancée of over a century. No matter how hard he fought, the loop always dragged him back. Until the day an unknown Precursor weapon shattered the cycle. Instead of peace, he wakes inside his battered spider-class mech in a world already dying. Here the rain itself is a curse, rivers and bodies of water birth monsters, and the creatures known as Stygians have plagued civilization for centuries. There is no escape from the horror, not even in the water. Long ago, the Kingdom of Babel drowned beneath the black Styx, and its cursed dead never stopped dreaming. Those dreams became the Stygians and the world has been rotting ever since. He couldn't save his own world. But maybe, in this broken one, he can finally break free. Or die a thousand times more trying. What This Story Delivers: + Time loop mechanics with consequences. Every death teaches, every loop refines tactics + Tactical mech combat. Strategy over plot armor, earned victories through experience + AI companion arc. Vigil evolves from tool to sentient being, central to the narrative + Grimdark atmosphere. Body horror, psychological trauma, morally gray survival + Competent protagonist. Altair is a veteran with 3,000+ loops of experience, skilled but broken + Tech Progression. Advanced military technology meets an atmospheric magic system + Mystery-driven narrative. What destroyed Terra? What are the Precursors? What is Babel's truth? + Slow-burn worldbuilding. Deep lore revealed organically, no exposition dumps This Story Is NOT: - LitRPG. No stats, levels, or system screens. Advancement through tech mastery and tactical experience - Power fantasy. Victories are earned through experience and cost rather than granted by the/a system - Harem or Romance-focused. The story centers on survival and mysteries, not relationships - Light-hearted. Expect trauma, loss, and difficult choices. This is dark Content Notes: !!! Contains graphic violence, body horror (Stygian creatures), PTSD themes, and psychological distress Update Schedule: 3 chapters per week Tuesday, Thursday, Saturday @ 4:30 AM PHT (UTC+8) US East (EST): Monday, Wednesday, Friday @ 3:30 PM US West (PST): Monday, Wednesday, Friday @ 12:30 PM Europe (CET): Monday, Wednesday, Friday @ 9:30 PM Patreon Supporters are 4 weeks ahead of Royalroad's public release schedule. Discord Server: https://discord.gg/JaqDNn3DQt This novel is only posted on Royalroad and Patreon. If you found this novel anywhere else in the internet, then please do message me so I could file a complaint and take it down. Thank you very much!~