Sapper

Sapper is a hostile Order creature classified under the Saboter order and encountered across multiple late-game sectors. Sappers wear the same white suit model as Lab Rats, distinguished by red lenses and explosives-related equipment, and they trade the Lab Rat's scanner for a rocket launcher as their primary weapon. They appear individually or alongside other Order troops and are found initially in the Reactors area and later spread to the Office Sector, Manufacturing West, Cascade Laboratories, Hydroplant and other locations as player progression unlocks their spawns.

Sappers function as demolitions specialists within the Order. Their in-universe role traces back to historical siege tactics — undermining fortifications to break prolonged sieges — and many are depicted as personnel assigned to this role as punishment for failures by ACH_INQ, while others volunteer because they view the work as essential to destroying human institutions. In combat they are hostile to all non-Order entities and behave aggressively rather than fleeing like Lab Rats.

Combat behavior and attacks make Sappers uniquely dangerous. They combine ranged explosive attacks and close-quarters aggression, constantly changing position to force the player into difficult choices:

• Rocket: fires a straight-path rocket from a launcher for large explosive damage.
• Frag Grenades: throws one or several grenades in succession.
• Double Punch: a blunt melee charge in which the Sapper closes to strike with both hands.
• Self-Destruct: a suicidal, large explosive attack where the Sapper arms beeping explosives, charges a target, and detonates, killing itself and capable of instantly killing the player if not avoided.

Practical strategy and interaction notes:

• Sappers will engage fights with manic taunts and will not flee; they may close for melee briefly but prefer to widen distance to use rockets and grenades.
• Fighting them in tight or confined spaces is hazardous because their explosives become much harder to evade. Prioritize creating room or relocating the engagement to safer ground.
• They are resistant to explosive and laser weapons relative to other enemies; defeating them at range with precision or by using other area explosives (for example, player grenades) can dispatch them quickly.
• If a Sapper is allowed to remain alive for a prolonged fight, it will attempt Self-Destruct regardless of its remaining health; eliminating them early or interrupting their approach is critical.
• When encountered with other Order troops (including heavy troopers and Breacher units), Sappers increase the threat level and should be high-priority targets in the engagement.

Drops, harvesting and acquisition:

• Sappers reliably drop PETN and have chances to drop Lodestone Fragments, Ornate Keys, and specific loot tables when killed under special conditions (e.g., blunt kills while stunned use a different table).
• Harvestable remains yield Human Skull (100%), Human Arm (Military) (50%), and a Sapper Suit (7.5%).
• Sapper suits and other items can also be acquired indirectly: they can appear in Reactors rooms (notably near kitchen and laboratory furnishings), be randomly obtained from breaking Security Wood Crates, Presents, or Reactors Wood Crates (including locations such as Shadowgate near the Witch trio and compound areas), and be produced very slowly by the Crafting Bench upgrade "Spontaneous Matter Synthesizer" (requires level 15 Crafting). Trading options exist as well; for example, a Raw Antefish Filet can be traded to Warren Bunning in the Office Sector for related goods.

Lore and miscellaneous:

• The GATE compendium entry frames Sappers as the Order’s demolition specialists historically linked to siegecraft and modernized into a punitive or ideological role within the Order.
• The Sapper’s rocket launcher design is noted to be based on the Saab Bofors Dynamics AT4.
• Encountering the first Sapper in the Reactors unlocks additional Sapper spawns in other Reactor locations and marks the beginning of their wider deployment across sectors.