Cosmic Convergence

After meeting with a Cosmic Entity, You have chosen to accept the Cosmic Convergence. Your body has begin to merge with the stars and nebula permanently, your hands to your forearms, and you feet to your shins now are coated in a inky black substance swirling with the Cosmos. Once per day you may use your wild shape to enter your celestial form, utilizing one form per wild shape used, gaining both of the benefits. Once this is used, you may not use Cosmic Convergence to the next dawn. Further interactions with the Cosmic Entity may grace you with more benefits and changes....

While in Cosmic Convergence, you gain the following Benefits. 

• You have advantage on Constitution saving throws that you make to maintain your concentration on a spell when you take damage.
• You can perform the somatic components of spells even when you have weapons or a shield in one or both hands.
• When a hostile creature's movement provokes an opportunity attack from you, you can use your reaction to cast a spell at the creature, rather than making an opportunity attack. The spell must have a casting time of 1 action and must target only that creature.