Path of Union

iunno, partner up with a buddy i guess?

Partner-up

When you reach 3rd level and gain this feature you may choose another creature with the Path of Union Subclass to form a Partnership and gain certain benefits.

When in melee range of your partner, you may spend half of your movement each to partner-up.
While in this state, you count as one creature until broken apart, and both act on the highest initiative between you. Additionally, you cannot be surprised, and enemies do not benefit from sneak attacks made against you.

Some additional abilities are granted while partnered-up:
On your shared turn, you and your partner can each take either an Action or a Bonus Action, not both. When you take the attack action, your partner may use their reaction to make an additional attack on the same creature.

Reckless Dervish

At 3rd level, while partnered-up, you and your partner may each make a reckless attack on your turn.
If more than one of you makes a reckless attack, you must both make a Con Save against a DC10.
If either fail, your union breaks and your rage ends.

Union Link

At 6th level, the presence between you and your partner begin to merge together.
Once per rage, you can choose to temporarily separate.
Choose one partner, only they can move that turn.
You can take any individual action as normal, but the partner that moved is forcefully teleported Back to the other at the end of your turn.

Vital Bond

At 10th level, you and your partner have begun to share your spiritual essence with each other.
When taking damage while partnered-up, you instead split it between you. Any resistances you have, are applied after the split.
You can also transfer health between each other.

True Union

When you reach 14 level and enter rage while partnered-up, you and your partner merge to become one creature that has bits and pieces from both base forms.
You gain the following benefits:

• You go up one size from the smallest partner.
• You have advantage on Wisdom, Charisma, and Intelligence Saves.
• Your individual resistances now count for the both of you.
• Your ability scores change to the highest between you and gain an additional +2 bonus across the board.
• Your max health becomes the highest between you + 5 x your average barbarian level.
• Your combined form may take a total of 2 Actions, 3 Bonus Actions and 3 Reactions on your turn.
• Any weapons you are wielding at the time of the merge that don’t have the thrown property take on a combined appearance.
  It has a base damage of 2d10 and is always versatile (2d12). If you are wielding a magic weapon, the merged weapon gains its enchantments. 
• You no longer risk breaking apart when making two reckless attacks on your turn using the reckless dervish feature.
• when using Union Link you create an ethereal body for the other mind to temporarily inhabit. This body has the same stats as the main body and actions, bonus actions and reactions are shared between you.
  This body has half the hit points of the main body and is destroyed when it reaches 0 hit points. any remaining damage carries over to the main body.
  You are no longer forced to return at the end of your turn, and may instead do so willingly as a bonus action.
• While in True Union, you are considered a shape changer and are immune to the effects of Polymorph and True Polymorph.