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I'm looking for a manhwa I read a few years ago that had a key plot element that went like this:
>The protagonists must enter a portal or something that has a goal inside. Each time they enter, it's further into the past of the world in the portal.
>The first one is to survive for a certain time against a horde of thousands of goblins in a ruined fortress. The world is in a terrible state and everything is dead.
>Time to prepare for the assault is short.
>The horde descends upon the fortress, bursting through defenses and climbing over walls. Thousands of them vs a small party of people.
>People die, but they barely make it as the timer runs out and they're teleported back, with death inches from their faces.
>The next time (or perhaps the time after that) they return, it's before a siege. They redirect a river to wash the enemy away.
>They return again in time to witness an assassination attempt on a princess.
This is all I can recall. Any ideas? I thought it was Tyrant of the Tower Defense but it's not that, and I don't think it's Suicide Hunter either.