Patient Zero

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Patient Zero
Patient Zero (Redemption).png
Statistics
TypeBoss
EnvironmentAbandoned Lab
AI TypePatient Zero AI
Damage110 / 220 (Contact)
80 / 160 (Xenium Blast)
80 / 160 (Xenium Laser)
Max Life340,000 / 408,000
KB Resist100%
Map Icon Patient Zero (Redemption).png
Map Icon
Kari
Kari (Redemption).png
Statistics
TypeBoss
EnvironmentAbandoned Lab
AI TypeKari AI
Damage110 (Contact)
Max Life200,000 / 240,000
Defense0
KB Resist100%
Drops

Patient Zero is a post-Moon Lord boss. He is the final boss of the Abandoned Lab, and will allow the player to deactivate all the laser security systems permanently.

While Patient Zero is alive, his exclusive Music will play.

Spawn[edit | edit source]

Patient Zero is found dormant in the final room of the Abandoned Lab. He is activated by right-clicking an object that looks like a hospital bed, found at the very bottom of the room. After his defeat, he will no longer be dormant in the room, but can still be spawned for rematches by right-clicking the bed again.

Behavior[edit | edit source]

Attacks[edit | edit source]

When the fight starts, Patient Zero will remain dormant for a bit. Then, his eye will open and he will start pulsating to signify his awakening.

Patient Zero goes through several phases based on remaining health. Every other phase, it will hand the fight off to Kari, a smaller NPC attached to Patient Zero that serves as a secondary boss of sorts. When Kari is vulnerable, Patient Zero is invulnerable, and vice versa.

During all of Patient Zero's active phases, he will summon Hive Growths, which chase players and occasionally fire plus-shaped energy bursts.

All of Patient Zero's attacks take on the form of Xenium Blasts or Xenium Lasers. Xenium Blasts are aimed green blasts that explode on impact with a wall, splitting into six smaller blasts. Xenium Lasers are large, solid laser beams that fire in preset patterns and are given away by red warning beams.

Phase 1[edit | edit source]

Patient Zero will begin by summoning 3 Hive Growths. He is invulnerable until at least three have been killed.

During this phase, Patient Zero will attack using the following attack cycle:

  • Xenium Lasers fired in a plus shape.
  • Four Xenium Blasts.
  • Xenium Lasers fired in an X shape.
  • Three Xenium Blasts.
Phase 2 (Patient Zero at 75% HP)[edit | edit source]

Patient Zero spawns several more Hive Growths and becomes invulnerable, as Kari becomes vulnerable. Kari also attacks with a fixed attack cycle:

  • Fires a barrage of green blobs at the player. These explode into gravity-affected green droplets on tile impact.
  • Fires four spreads of arcing green droplets upwards.
Phase 3 (Kari at 75% HP)[edit | edit source]

Kari becomes invincible and passes the fight back to Patient Zero. Patient Zero will attack with a new attack pattern:

  • Sequentially firing eight Xenium Lasers in a clockwise order.
  • Firing three, 3-shot spreads of Xenium Blasts.
  • Firing Xenium Lasers in a plus shape, and firing more in an X shape right afterwards. The resulting beams form an eight-pointed star shape.
  • Firing three more 3-shot spreads of Xenium Blasts.
Phase 4 (Patient Zero at 50% HP)[edit | edit source]

Kari becomes the target again. He uses the same attack cycle as before, but his arcing shots fire in a wider spread and he will now fire four aimed green laser beams after his arcing attack.

Phase 5 (Kari at 50% HP)[edit | edit source]

Patient Zero becomes the target, and changes his attack cycle again.

  • Fires three, 3-shot spreads of Xenium Blasts.
  • Fires Xenium Lasers in an eight-way pattern.
  • Fires three more spreads of Xenium Blasts.
  • Fires eight Xenium Lasers in a clockwise, sequential order.
Phase 6 (Patient Zero at 35% HP)[edit | edit source]

Patient Zero spawns in a few more Hive Growths as he becomes dormant, and Kari becomes the target and switches his attack cycle.

  • Fires five even wider spreads of arcing green droplets upwards.
  • Fires four aimed green lasers
  • Fires an aimed burst of larger green blobs. These bounce off walls once before bursting into gravity-affected green droplets.
Phase 7 (Kari at 25% HP)[edit | edit source]

Patient Zero becomes the target and switches his attack cycle one more time.:

  • Fires Xenium Lasers in a plus shape and a narrow X shape, in quick succession. Once the lasers have subsided, immediately fires another burst in an eight-way pattern.
  • Rapidly fires five Xenium Blasts.
  • Fires Xenium Lasers in an eight-way pattern
  • Fires three Xenium Blasts.
Phase 8 (Patient Zero at 10% HP)[edit | edit source]

Kari becomes the final target and attacks with all attacks in his arsenal (?)

Upon Kari's defeat, Patient Zero will die as well.

Aftermath[edit | edit source]

  • Stronger enemies start spawning in the Cavern and Surface layers, which drop the materials used to fight the Ancient Deity Duo.
  • Unrefined Shinkite generates in the upper layers of the Underworld.
  • Star Serpents start spawning in the Space layer.

Tips[edit | edit source]

  • Constantly move around, the smaller Hive Growths take time turning so you could circle around them in a small radius quite easily.
  • Despite Patient Zero's giant body, the eye is the only part you can get damaged by.

Trivia[edit | edit source]

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

History[edit | edit source]

Characters: Forest Golem (Redemption).png Pre-Hardmode Enemies • Bob the Blob (Redemption).png Hardmode Enemies • Ancient Archer (Redemption).png Post-Moon Lord Enemies • Chicken Bomber (Redemption).png Event Enemies • The Janitor (Redemption).png Mini-Bosses • Thorn, Bane of the Forest (Redemption).png Bosses
Chicken (Redemption).png Critters • Friendly T-Bot (Redemption).png Friendly NPCs