Darkness Survival Review

There are magic scrolls that work once and rarer scrolls that let you learn the spell for the rest of the run.

You can buy the premium currency, but you get enough of it through normal play that it's not required.

One of them is a rogue, but you have to unlock it.

Each time you die or defeat a boss (every five floors) you get permanent upgrades, in the form of Runes (which you can swap out to customize your class at the start of each game) or Recipes (which you can use to craft items from materials found in-game).