Tyrian boss: Null Shield Ship
Null Shield Ship is a boss of Tyrian, fought in 4 levels: Torm (episode 2), Botany A (episode 2), Botany B (episode 2), ?Tunnel? (episode 4).

Fights
Each fight lists the parts the game tracks with the boss health bar. Pictures link to each part's card in the bestiary; armor is at Normal difficulty.
Torm (episode 2)
Picture: parts placed as the level spawns them.
4 parts, armor 254 each at Normal difficulty.
Botany A (episode 2)
Picture: parts placed as the level spawns them.
4 parts, armor 254 each at Normal difficulty.
Botany B (episode 2)
Picture: parts placed as the level spawns them.
4 parts, armor 254 each at Normal difficulty.
?Tunnel? (episode 4)
Picture: parts placed as the level spawns them.
4 parts, armor 40 each at Normal difficulty.
Name and sources
Fandom gives it as the boss of Torm, Botany A, Botany B and ?Tunnel?. The first three track the same green jungle_fortress parts (14 to 17); in ?Tunnel? those parts appear in the level but the health bar follows four blade_spinners parts, so that last link rests on the level only.
- Tyrian Fandom wiki, level pages (boss field of the level infobox)
- Tyrian Fandom wiki, boss pages
- Null Shield Ship on the Tyrian Fandom wiki
Technical names
Parts as named for modders: jungle_fortress_14, jungle_fortress_15, jungle_fortress_16, jungle_fortress_17, blade_spinners_01, blade_spinners_02, blade_spinners_03, blade_spinners_04.
Sprite banks: Jungle fortress, Blade spinners.