Collective Consciousness

You and your Familiar share a strong mental bond so long as you have your familiar summoned you gain the following benefits.

• Increase your intelligence score by 1, to a maximum of 20. (Permanently, this isn't familiar linked)
• You may concentrate on a number of additional spells equal to your and your familiars collective wisdom modifier Minimum 1.
• So long as both you and your familiar are not struck simultaneously in combat you have advantage on your concentration checks against taking damage. 
• For each spell you are concentrating on above 1 you must make a intelligence save DC equal to (your spell DC + The number of spells concentrated on) or take 1d10 psychic damage damage per failed spell save and lose concentration on those spells.
• The load this concentration brings on your mind is immense, your familiar takes some of this load from you sharing its mind with yours. If your familiar dies or is sent into its pocket plane you instantly lose concentration on all spells currently active as the loss of your familiar plays havoc on your mind.