The dark brotherhood has a great quest line in Oblivion.
The Elder Scrolls
The Elder Scrolls (commonly referred to as TES) is an award-winning series of roleplaying games created by Bethesda Softworks. Set in the vast world of Nirn, The Elder Scrolls series is renowned for the level of unprecedented control given the player over his or her character's destiny, establishing itself as the benchmark in immersive, independently-living worlds for the RPG genre.
RULES:
-
Off-topic discussion (Included but not limited to irl politics, religion, real world issues) is banned. You can discuss it to a light level in the comments, if it's in relation to the games.
-
Racism, sexism, homophobia, transphobia, and ableism is not allowed, and will result in a ban.
-
NSFW is not allowed.
-
AI-generated content is strongly discouraged.
Thank you, I'll definitely check it out. I'm planning to play a stealth mage, so it fits with the play style as well. Is there anything special I have to do to activate the quest line?
I think you just need to kill an NPC. I can't quite remember.
Another tip is the leveling system is busted as hell. For instance, health increases by a rate in relation to your endurance level. If you don't level up endurance early, your character can be fragile later on.
You don't have to max out endurance, just keep it maintained.
There's a quest to kill a unicorn, but you can find it before the quest becomes available and claim it as your horse. Just don't draw your weapon in front of it (it will aggro on you). Also don't forget to loot the horn if it dies, it's the item you need to finish the quest.