Ironstretch Buckler

Armor (shield), very rare (requires attunement)

This iron +2 shield affixes to the body through spiked chains wrapped around the forearm. The spikes’ punctures are painless and ensure a firm fastening, without leaving behind any wounds.

You can meld your flesh with the shield as an action, turning your shieldbearing arm into living iron for up to 5 minutes per day.

This duration need not be continuous, but it must be used in 1-minute increments.

The organic metal is extensible and allows you to increase the iron arm’s reach by 5 feet at will.

While the arm remains in iron form, your armor bonus increases by 1. At the beginning of your turn, you can forego your shield bonus to armor class and give it to an adjacent ally for 1 round. While your arm is iron, you gain disadvantage on all Dexterity checks and Strength (Athletics) checks.