Domains:Usually, new domains are just added to existing domains of the deity. Normal clerics still only choose two domains to gain the powers and spells of, they just gain a greater range of domains to chose from. DM adjucating is required when the domains aren't expressly stated. Some DM's, for instance, want to add Magic to Correllon Larethian's domain list. With this rule, they are free to do so. Domain Spells:Domain Spells are replaced, not added on as alternates. If you are using a "house rule" domain spell, it replaces the spell of the equivalent level.