Rogue's Tale

Rogue's Tale is a single player turn-based dungeon crawling game with some RPG elements. It was published on PC in 2012 and it has been regularly updated since then.
The game takes place in a place called Frostmourn Keep and its underlying dungeons located in the World's End Mountains. The goal is to overthrow the current king and become the new king.
There's dozens of talents and spells to build your character with, before their untimely permanent deaths. There's also a heritage system where you can unlock buffs that affect all future attempts.
Note that this game is hard. Every time you tap on the screen and make an action, a bad roll of the dice can kill you right there or lead you to a path that is no longer viable, or the situation is only recoverable if your next few actions are played correctly. If you have not played games like this before, there is a very high chance that you will not make it through the first dungeon, and in fact many lives are lost in the first level. Even the very first move that you make in this game can get you killed.
There is, however, a casual difficulty level that is recommended for new players to unlock crafting, stash boxes and the recently added collectible card game. It's possible to spend a hundred hours just by collecting crafting schematics and cards while completing some of the easier heritages and learning game mechanics in preparation for normal difficulty.