Null Sentry

Sandbox Only Content

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Null Sentry was previously removed from the game on the 5th of October 2026 as it was part of the Halloween 2026 Live Events, though it has been made available through the Sandbox mode.
It is not accessible anywhere else in the game, aside from in Sandbox Mode. This page will attempt to include information about both the version before removal and its re-added version.

Similar Article

This article is about Null Sentry. You may be looking for other uses of Sentry or other uses of Null.

Null Sentry
Mode Appearance	Sandbox via Logbooks Originally: Null & Void Night III (Easy) Null & Void Night III (Hard) Halloween 2026 Live Event
Wave Debut	N/A
Statistics
Base Health	500
Defense	100%
Speed	Immobile (0)
Spawned By	Null Engineer
Hidden?	No
Flying?	No
Ghost?	No
Lead?	No
Attributes	None
Ability
Ability	Firerate Drain - Upon creation, targets a random tower, applying a 40% Firerate Debuff (66.67% increase) to it until the Null Sentry is destroyed. Has a range of 20.

Description

The Null Sentry, internally referred to as the Corrupted Sentry, was an enemy that does not appear naturally, as it can only be spawned by the Null Engineer in the Null & Void Event and Halloween 2026 Live Events. It had a low amount of health, a high Defense and it cannot move. It can however, debuff a random tower, making it fire slower.

Logbook Description

"The Null Sentry was created using the schematics stolen from Engineer. After the Nil Zone tore through the realm, it replicated her and created Null Engineer. Unlike traditional materials, Null Sentries are created out of condensed energy, which can be materialized by its creator."

Appearance

The Null Sentry is a corrupted recreation of the War Machine Sentry. It has four legs, a minigun and two missile launchers. It is colored red and black.

Mutation

Assumes that Mutation is activated and a Gravestone is created on the earliest wave possible of the Blind Faith Hard difficulty.

Mutation
Percentage	Increase
2.5%	12.5
Wave	Health
13	513
14	525
15	538
16	550
17	563
18	575
19	588
20	600
21	613
22	625
23	638
24	650
25	663
26	675
27	688
28	700
29	713
30	725

Event Strategy

As this enemy only appears through Sandbox mode, no strategy section is made for its current version. Instead, a strategy section for the one that appeared without Sandbox mode in Nil Zone II is listed instead.

• The Null Sentry itself is not that large of a threat, as it can only affect one tower at a time in a limited range, while also not being capable of actually reaching the exit.
  • It can, however, be annoying to take out, as it will usually not be possible to be targeted by most targeting options.
• The Commander can be used to partially mitigate its debuff.

Gallery

Corpse Variants

• 
  Second Corpse variant, current version (31 October 2025 – Present)

Miscellaneous

• 
  Null Senbtry on its Index icon.

Trivia

• The Null Sentry is unaffected by enemy appearance modifiers, such as Talk Like a Pirate Day.

Update History

• 31 October 2025 - v1.79.0
  • Null Sentry added.
• 26 November 2025 - v1.80.1e
  • Null Sentry removed from the main game, now appears exclusively in Sandbox mode.
• 3 December 2025 - v1.82.0
  • Bug: Cannot be spawned in Sandbox mode.
• 4 December 2025 - v1.82.0b
  • Bugfix: Can now be spawned in Sandbox mode.
• 25 September 2026 - v2.11.2
  • Null Sentry re-added to the main game in the Nil Zone II as part of the Halloween 2026 Live Events.
• 28 September 2026 - v2.12.1a
  • Null Sentry removed from the main game, now appears exclusively in Sandbox mode.
• 2 October 2026 - v2.13.0
  • Null Sentry re-added to the main game in the Nil Zone II as part of the Halloween 2026 Live Events.
• 5 October 2026 - v2.13.0a
  • Null Sentry removed from the main game, now appears exclusively in Sandbox mode.