Patient Zero

Type	Enemy
Damage	0 (Contact); 140 / 210 / 315 (Tear of Pain Ball); 70 / 105 / 158 (Tear of Infection); 126 / 189 / 284 (Tear of Infection Ball, Poison Beat, Infectious Beat); 133 / 200 / 299 (Caustic Tear Ball)
Elemental damage
Max Life	120,000 / 180,000 / 270,000
Defense	10
Elemental multipliers	1.25x; 1.15x; 0.75x; 0.75x
KB Resist	100%
Inflicts debuff	Burning Acid 100% chance;
Debuff duration	1.33 seconds (Xenium Laser); 2 seconds (Tear of Infection, Poison Beat); 3 seconds (Caustic Tear, Tear of Infection Ball, Tear of Pain); 4 seconds (Caustic Tear Ball); 5 seconds (Tear of Pain Ball)
Debuff tooltip	Reduced defense
Immune to
Coins	10

Type	Boss
Environment	Abandoned Lab
Damage	0 (Contact); 120 / 180 / 270 (Xenium Blast, Tear of Pain Ball); 144 / 216 / 324 (Xenium Laser); 102 / 153 / 230 (Caustic Tear, Xenium Miniblast); 114 / 171 / 257 (Tear of Pain)
Elemental damage
Max Life	198,000 / 297,000 / 445,000; 318,000 / 477,000 / 715,000 (Total)
Defense	64; 80 (During laser attacks)
Elemental multipliers	1.25x; 1.15x; 0.75x; 0.75x
DR	25% (After defeating ADD)
KB Resist	100%
Inflicts debuff	Burning Acid 100% chance;
Debuff duration	2 seconds (Xenium Miniblast); 3 seconds (Caustic Tear, Tear of Pain); 5 seconds (Xenium Blast, Xenium Laser, Tear of Pain Ball)
Debuff tooltip	Reduced defense
Immune to

Patient Zero is a post-Moon Lord boss that is fought in the final section of the Abandoned Lab.

While Patient Zero is alive, the music Xenostate will play.

Spawn

Patient Zero is found dormant in the final room of the Abandoned Lab named "Sector Zero". Damaging its eye will intiate the fight after a short build up.

To resummon Patient Zero after defeating it, the player needs to use the Hologram Remote in Patient Zero's arena.

Behavior

When the fight starts, Patient Zero will remain dormant for a bit, waiting for the music to build up. Setting the music volume to 0 will begin the fight immediately.

The fight with Patient Zero is divided into multiple phases. Every next phase Patient Zero becomes invulnerable and opens its lower part, revealing Kari Johansson. After Kari's phase is over, he becomes invincible instead, switching to Patient Zero. Patient Zero retains its attacks from previous phases, while Kari's attacks always change depending on the phase.

If the player defeats Ancient Deity Duo, Patient Zero will gain 25% damage reduction. Whenever Patient Zero performs an attack that includes Xenium Lasers, its defense will increase to 80.

Phase 1 (Patient Zero 100%-75% health)

Fires 4 Xenium Lasers in a plus shape, as well as 12 Caustic Tears in a circle.
Launches 3 Xenium Blasts directly at the player. The Blasts split into 4 Xenium Miniblasts upon impact.
Fires 4 Xenium Lasers in an X shape, as well as 12 Caustic Tears in a circle.
Launches 4 Xenium Blasts in random directions.
Fires 2 pairs of horizontal Xenium Lasers that rotate in a way that forces the player to stay above or below Patient Zero. During this attack, Patient Zero also shoots Caustic Tears directly at the player.
Launches 2 Xenium Blasts to the left and right of the player, followed by a Xenium Blast directly at them.

Phase 2 (Kari 100%-75% health)

Launches 4 Tear of Infection Balls that split into 2 Tears of Infection on impact.
Fires 6 arcing Posion Beats in random directions.

Phase 3 (Patient Zero 75%-50% health)

Fires 4 rotating Xenium Lasers while shooting Caustic Tears in 4 rotating directions.
Launches 5 Xenium Blasts directly at the player.
Fires 2 horizontal Xenium Beams that slowly rotate before switching their direction. During this attack, Patient Zero fires Tears of Pain directly at the player, as well as in the opposite direction.
Launches 3 Xenium Blasts at the player, then a singular Blast, then 3 Blasts again.
Fires 4 pairs of Xenium Lasers in an X shape that slightly converge on each cardinal direction. Patient Zero also launches 4 Tear of Pain Balls that split into 2 Tears of Pain upon hitting a tile after bouncing once.
Launches 5 Xenium Blasts in random directions.

Phase 4 (Kari 75%-50% health)

Launches 4 Caustic Tear Balls that split into 2 Caustic Tears on impact.
Fires 6 arcing Posion Beats and 4 arcing Infectious Beats in random directions.
Fires 4 Xenium Lasers aimed directly at the player.

Phase 5 (Patient Zero 50%-35% health)

Shoots 8 lasers in all cardinal and ordinal directions, with 5 out of the 8 sections created by lasers being barraged by Xenium Miniblasts. The affected areas will be highlighted before the firing the lasers.
Launches 2 bursts of 4 Xenium Blasts.

Phase 6 (Kari 50%-25% health)

Launches 4 Tear of Pain Balls that split into 2 Tears of Pain on impact.
Fires 8 arcing Posion Beats and 4 arcing Infectious Beats in random directions.
Fires 7 Xenium Lasers aimed directly at the player.

Phase 7 (Patient Zero 35%-10% health)

Uses all previous attacks at random.

Phase 8 (Kari 25%-0% health)

Uses the attacks from the previous phase.

Aftermath

Star Serpents start spawning in the Space layer.

Notes

Patient Zero takes 33.3% damage from Last Prism and 40% damage from Empyrean Blind's orbs.

Trivia

The Bestiary entry for Patient Zero: "An unfortunate scientist, mutilated and disfigured by the Xenomite infection. This specimen was Kari Johannson, the father of all T-Bots and patient zero of the xenomite infection. He's been stuck for 50 years, conscious and aware of the situation around him... God, that must be tormentous."

The term "patient zero" refers to the Index case or the first patient infected in an epidemic.

History

0.8: Revamped again.
0.7.8: Revamped.
0.7.0: Introduced.

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