Soulmates

Your best friend, your soul mate, your love, your... patron? This patron is another player playing this class, you must both choose this subclass. Your love is ever-binding, allowing for all sorts of partner-based fun. Become the parents of the group, but try not to say "Go ask your father" too much, because this bond can NOT be broken! 

Death's Wish

When you choose this subclass at level 1, you are bound to your soulmate "Till death do you part." This bond cannot be broken, and when your soulmate dies, so do you. 
When either are downed, so is the other, and they now both share death saving throws. 

Expanded Spells

Soulmate lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Spell Level	Spells
1st	Cure Wounds, Guiding Bolt
2nd	Flaming Sphere, Lesser Restoration
3rd	Daylight, Revivify
4th	Guardian of Faith, Wall of Fire
5th	Flame Strike, Greater Restoration

Soulbound

A number of times equal to your warlock level per day, you may use a reaction to absorb half of the damage dealt to your soulmate. Charges reset on a long rest.

Swap

Starting at the 6th level, you gain the ability to swap places with your soulmate up to a range of 300 feet. You do not need to be able to see your soulmate.
You can use this trait a number of times equal to your proficiency bonus and expended uses recharge on a long rest.

Parental Figures

Your long lasting love of your patron/soulmate is beginning to take affect on those around you. When you and your partner do any healing to one another, party members within 30 feet also heal for half that much. This trait can be used a number of times equal to your proficiency bonus. 

Fusion

Your love for your soulmate has become so powerful that you wish for nothing more than to be one with them.

Starting at level 14, you gain the ability to fuse with your soulmate to become more powerful.

You can use an action to say the command word and fuse with your partner physically. When fused, you gain all of the following.
• Advantage on all attack rolls and ability checks.
• Combined current and maximum HP, which divides evenly upon splitting. 
You may also choose which soulmate carries the following into the fusion
• Mental: INT, WIS, and CHA stats and proficiencies as well as spells are carried over.
• Physical: STR, DEX, and CON stats and proficiencies as well as armor and weapons are carried over.

Your fusion lasts for 1 hour and can be used once per long rest. You can gain another use at level 18.