Hull

Hull refers to a ships health.

It is indicated by the segmented red bar on top of a ship, decreasing from right to left when damage is taken. When the hull bar is completely depleted, the ship is destroyed. In the player's case, the run is lost.

Hull damage taken by the player persists across combats. This makes the ship's hull a vital resource to manage.

Damage

Damage is commonly taken when a damaging attack or midrow object hits a ship part. Enemy ships telegraph intent of attacking.

Other sources of hull damage are Overheating, Corrode, and some cards.

Damage Mitigation

Hull damage can be mitigated by Shields, see its page for more info.

Perfect Shield completely nullifies hull damage while active.

Max Hull

Exhaustive list of interactions that can increase or decrease the max hull of the player.

Start Run	Max Hull	Condition
Boot Sequence	Gain 3	Choice
Boot Sequence (Hardest)	Lose 2	Choice
Events	Max Hull	Condition
Boss	Gain 2 (1 on Harder+)	Defeat the Boss
Ship Shuffler	Gain 1	Choice
The Duplitron	Lose 3 (4 on Hard+)	Choice
Low Health Event	Max Hull	Condition
Worthwhile Trade Repairs	Gain 3	Choice (Lose 1 random artifact)
Cards	Max Hull	Condition
Pillage and Plunder	Gain 1	Card deals final blow
Artifacts	Max Hull	Condition
Hardmode (Hard)	Lose 1
Hardmode (Harder+)	Lose 3
Hull Plating	Gain 3	On pickup
Adaptive Plating	Gain 1	Kill a Boss/Elite
Scrap Armor	Gain 2	Get hit 10 times, Single use
Tridimensional Cockpit	Lose 50%	On pickup

Note: Interactions that increase Max Hull also heals that same amount, meaning your missing hull doesn't increase. Losing Max Hull does not lower your current hull unless your Max Hull becomes less than your current hull. It is possible to die by reducing your Max Hull to 0, though you'd have to be doing this voluntarily.

Healing

Repair Yards are a player's primary way to regain back lost hull ( Gain 50%). Considering this is the same location that offers card upgrades and removals, this is an opportunity cost.

Exhaustive list of other ways of healing the ship of the player.

Low Health Event	Hull	Condition
Garbage Girl Repairs	Heal 50%	Choice
Abandoned Ship Yard	Heal 50%	Choice (67% to enter combat w/ lesser heal)
Worthwhile Trade Repairs	Heal 99	Choice (Lose 1 random artifact)
Midrow Object	Hull	Condition
Repair Kit	Heal 2	Heals its destroyer
Card	Hull	Notable Traits
From Hell's Heart A	Heal 1
Leech	Heal 1	Exhausts
Leech A	Heal 2	Exhausts
Leech B	Heal 1
Bloodstone Bolt	Lose 1 Heal 1	2 Shards
Bloodstone Bolt A	Lose 1 Heal 1	1 Shard
Bloodstone Bolt B	Lose 1 Heal 2	Exhausts, 2 Shard
Battle Repair	Heal 1	Exhausts
Battle Repair A	Heal 1	Exhausts
Battle Repair B	Heal 4	Single Use
Hot Compress	Heal 1	Exhausts, 3 Heat
Hot Compress A	Heal 1	Exhausts, 2 Heat
Hot Compress B	Heal 1	Exhausts, 3 Heat, 0 cost
Bruise	Lose 1 Heal 1
Bruise A	Lose 1 Heal 1 Lose 1 Heal 1
Perfect Specimen	Heal 2	Single Use
Perfect Specimen A	Heal 5	Single Use, 0 cost
Perfect Specimen B	Heal 2	Exhausts
Ephemeral Repairs	Heal 4	Single Use
Artifact	Hull	Condition
Nanofiber Hull	Heal 1	Triggers after combat
Heal Booster	Heal 1	Triggers on other heals
Scrap Armor	Heal to max	Single Use
Rebound Reagent	Heal 1	Lose hull; Once per combat.

Note: Most percent (%) based heals are rounded down.