Magitek Exosuit

Magitek Exosuit is an attire in Final Fantasy XV added in patch 1.13. It makes the party invincible. Its description says it was recovered and repurposed by Cid Sophiar. It glows in combat, especially noticeable in the dark, and there is an effect when it absorbs an attack.

Magitek Exosuits come with a damage counter, and taking damage reduces it. When it expires, the suit no longer protects against damage, but will remain on the characters. The counter can be viewed in the Gear Menu by highlighting the Exosuit and pressing the Details button.

The counter refills 20 hours from when that party member first takes damage. Each party member has this calculated separately. If the party member doesn't take enough damage to deplete the counter, the suit will simply recharge every 20 hours.

Manipulating the console's timer forward allows for an earlier recharge. However, this would mean one needs to keep forwarding the clock to get recharges unless the player waits out longer.

Development
Square Enix initially announced a DLC outfit, Magitek Exosuit, for season pass holders, but it was never released because the publisher of Power Rangers thought the design was too close to their intellectual property. A redesigned costume was released in patch 1.13 free for everyone.

The redesigned version looks like General Glauca's armor from Kingsglaive: Final Fantasy XV.

Etymology
In Final Fantasy XV, magitek is the technology used by the Niflheim Empire, likely as an allusion to the Gestahlian Empire from Final Fantasy VI where the term was first used in the Final Fantasy series.

Exosuit refers to a, a wearable mobile machine powered by a system of electric motors, pneumatics, levers, hydraulics, or a combination of technologies that allow for limb movement with increased strength and endurance.