This article is for the PC version of Stellaris only.
Shields form the first layer of hit points of a ship. They have inherent regeneration of 1% of their base health per day. All shield techs except Psionic Shields and Dark Matter Deflectors can be obtained through normal research. Psionic Shields can only be acquired as a psionically ascended empire through the appropriate Shroud Event; Dark Matter Deflectors can only be acquired through reverse-engineering Fallen or Awakened Empire ships.
Armor forms the second layer of hit points of a ship. All armor techs can be obtained through normal research except for Dragonscale armor which must be obtained by defeating the Ether Drake.
Hull is the last layer of a ship's hit points; the ship is destroyed if the hull points reach 0. All ships have some inherent hull points; this can be increased with these Plating components.
These are only acquirable by reverse-engineering destroyed Crystalline Entities.
Auxiliary modules go in Auxiliary slots and have a variety of effects. Regenerative Hull Tissue can be acquired by defeating various spaceborne aliens. Enigmatic Encoders and Decoders can be acquired by defeating the Enigmatic Fortress.
Hull and armor regeneration
While shields have inherent regeneration, hull and armor do not. This means that, at default, damaged ships cannot be restored to full fighting capability without returning to base, which limits operations far away from starbases. Therefore, securing at least one source of hull and armor regeneration is useful, especially for offensive operations. Options include:
- Living metal is a cost-effective option, since it does not take up any ship slots, and is potentially available to all empires. However, as a strategic resource, not all empires may have a source within their borders, and the supply could potentially be raided.
- Regenerative Hull Tissue can be slotted to any ship, making it one of the most reliable sources of regeneration. However, the regeneration rate does not scale with hit points, and it takes up a precious auxiliary slot.
- The Nanobot Cloud aura can be fitted to Titans, with effects slightly stronger than Regenerative Hull Tissue. Of course, this also takes up a very valuable slot that could have been used for something else.
- The Engineer admiral trait gives hull and armor regeneration, but this cannot necessarily be counted on for any particular admiral to have.
- Devouring Swarms have inherent hull and armor regeneration.
- Psionically ascended empires may have an option for hull and armor regeneration as a Shroud boon. However, this cannot be counted on to be an option at any given time.