Arcane Prosthetic Arm v1.3

This Prosthetic Arm moves as if it were a standard arm with the same motion and mortar function to the user. The component does not feel pain and crashes small items with its enhanced strength quite easily. The arm has runes carved around it that form a very small/passive anti-magical barrier preventing the item from being dispelled. This anti-magical barrier can not be copied down or replicated by any spell caster. 

Upgraded Defense. The arm also has a force energy attack feature, when the wearer takes damage they can use a reaction to release a wave of Ether around them in a 10-foot radius and pushes the attacker back 10 feet. The attacker makes a dexterity saving throw, on a successful save the attacker takes half damage and does not get pushed back, on a failed save the attacker takes full damage and gets pushed back. The damage dealt is 1d20+ your Intelligence modifier. 

Plagued by the Past (Or the future?). Glimpses of the future begin to press in on your awareness. When you finish a long rest, roll two d20 and record the number rolled. You can replace any attack roll, saving throw, or ability check made by you or a creature that you can see with this foretelling roll. You may choose to do so before the roll.
Insight into Entropy. The knowledge of the future brings about the thoughts that all things will eventually end and countless things already have. At the Beginning of Combat you may roll 1d8 and record the number rolled. You may, using your reaction sometime during this combat, apply this number as a positive modifier to you or an ally's roll. You may use this feature a number of times equal to your Proficiency Bonus until you Long Rest. 

Martha's Maestoso. You have begun to unlock a power beyond your comprehension. Your magic  is reacting to the world in a way you've never seen before and the world is responding in kind.  Using a spell slot of 1st level or higher you may repair non-magical and magical object's (at or below Uncommon in Rarity). You may also use this to restore structures contained within a 10-foot cube, or eight connected 5-foot cubes, given you are not in combat. 

Flexible Forces. The forces of Ether are strange and labyrinthine. You feel the effects of time on things. Not just you or others, but on objects and the space around you as well. You can feel and shift the forces of time on yourself and other things. Get creative with this ability and your Dm will Reward you!
You gain 1 Major Beneficial Property and 1 Minor Detrimental Property linked to this arm as soon as you receive this item.