Info | The Guilds' quests Oblivion Guide

Save for the Main Quest, the four Guilds are the longest and the most complicated series of quests in Oblivion. It's interesting that one character can actually join and become the master of all four of them simultaneously. That may not be the best thing when it comes to the game's replayability, but on the other hand it can certainly lengthen the play time to some extreme values.

The guide's author after even more work.