He died, but not quite. Magnus was reborn as Einar, a young Viking.
“You old bastard Odin, you set me up?”
“No, I'm training you to become a god.”
He'd wanted to keep his head down and build up his land, but Ragnarok was drawing near and the Nine Realms were in turmoil.
Luckily, he had the Heroic Spirit System. His runes could level up, his attributes could double, and death came with reduced penalties!
Even more absurdly, he discovered that he grew stronger with every battle, and could even attract the gods' wagers...
[Legendary Rune: Power of Gungnir (Activated)]
Odin: “Go, my warrior. The fate of the Nine Realms rests on you... By the way, Loki and I made a bet on whether you'll survive the week.”
Knocked out by a rock from the start, then waking up to find a troll blocking the door? Magnus was furious. “I fight modern wars. Who the hell fights with medieval weapons in hand-to-hand combat?”
But when he picked up the battle-axe and found it felt absurdly good in his hands...
“Hmm? This is actually great!”
He'd planned to lie low and level up, but the System's mission popped up right in his face: “First Battle Mission: Solo-kill a forest troll. Reward: Strength +1, Odin's attention +100.”
Looking at the rusty axe in his hand, then at the three-meter-tall troll, Magnus flipped it off. “The gods these days really know how to set a guy up!”
This is a hardcore strategy log about a modern special forces soldier grinding dungeons and levels across the Nine Realms, while teaching the gods how to behave.