User:Llareian/sandbox

The joinable factions vary for each game, but in both games you can join the Blades, the Fighters Guild, the Mages Guild, and the Thieves Guild. In both games, NPCs' dispositions and behaviors toward you will be affected by both their faction memberships and yours.

Morrowind Factions	Oblivion Factions
Belonging to one faction can prevent you from joining another (notably, the Great Houses and the Vampire Clans).	You can belong to all joinable factions at one time.
Being a member does not grant you special access to doors or items on the faction's properties.	Being a member grants you ownership to most doors and items on the faction's properties.
A faction's quests may require you to kill an NPC essential to another faction's quest.	You can never kill an NPC essential to another quest until after he or she is no longer essential.
You do not need to finish all of a faction's quests to advance to its highest rank.	All of a faction quests must be completed to achieve its highest rank, except for quests that only become available at the highest rank.
Advancement is dependent upon completing a certain number of quests (in no particular order) and having sufficiently high skill levels within the faction's favored skill set.	Advancement is dependent only upon completing the required quests, usually in a linear fashion. There are no skill level requirements.