An insurmountable skullfort Upgrades | Destiny Wiki

First Upgrade

• Infusion - Replenishes health each time you pick up an Orb of Light.

Second Upgrade

• ARMOR ENHANCEMENT UPGRADE - Increases this Armor's defense.

Third Upgrade

• IMPACT INDUCTION - Causing damage with a melee reduces your Grenade cooldown.

Unique Upgrade

• IMPROVED TRANSFUSION - Melee kills immediately begin health regeneration. You also respawn with full melee energy.

Final Upgrade

• HARDEN - Increases Defense but locks in all previous choices.