Resonant Armor

"Exquisitely crafted Altairian armor that resonates with equipped shields to increase their energy."
 * -|Regular=

"Energy resistant Altairian armor with shield energy enhancement."
 * -|Spectral=

"Explosive resistant Altairian armor with shield energy enhancement."
 * -|Shockwave=

"Kinetic resistant Altairian armor with shield energy enhancement."
 * -|Deflector=

"Alien resistant Altairian armor with shield energy enhancement."
 * -|Xeno=

"Plasma resistant Altairian armor with shield energy enhancement."
 * -|Plasma=

General
Resonant Armor is a sturdy ship armor that also increases the durability of ship shields. It is limited to Altairian Hulls.

Spectral, Shockwave, Deflector, Xeno and Plasma Resonant Armor feature damage resistance and a greater bonus to shield energy compared to regular Resonant Armor.

Advantages
Resonant Armor not only provides heavy protection, but also increases the shield energy of your ships, allowing your ships to become more durable.

The elemental versions build on this protection by reducing the amount of damage taken from the respective damage type.

Against Altairian Event Targets, Spectral is effective against Vanguards and Motherships, Shockwave against Brigades and Regiments, Deflector against Outposts and Fortresses, Xeno against Outriders. Plasma Resonant Armor is a universal defense against high-level Altairian Event Targets as they all deal Plasma Damage to some extent.

For PvP, refer to here for general guidelines on when to use the Spectral, Shockwave and Deflector variants. The Xeno version provides extra protection against common Alien Damage weapons such as the Xeno Epsilon ECHO Cannon.

The Xeno version is useful against other Altairian Hulls that have Alien damage weapons equipped; the Plasma version is likewise useful against Pharmakon Hulls that have Plasma damage weapons equipped.

Disadvantages
Regular Resonant Armor is less mass-efficient than Tungsten Armor, though it does provide a lot more health.

Do note that Elemental Resonant Armor is slightly less mass-efficient than the regular variant, so be sure to put your resistances to use.

Trivia

 * This item's build time was significantly reduced during the late April 2019 update as summarized here.
 * Its repair time was nullified as a result of the late September 2020 update, which updated the repair time of all Tier 7 ships to be invariant to equipment.