Mysterious Stranger brings one of Fallout’s best perks to the factory floor. When your character damages an enemy, there is a tiny chance a stranger in a trench coat steps out of nowhere, drops your target in one shot, tips his fedora, and is gone before the smoke clears. A line of flying text, an audio sting, and a chat message mark each visit. You never see him coming, and a 60-second cooldown makes sure you never get used to him.
Beta. Built, packaged, and staged for the Factorio mod portal with the same two release lines as my other mods: 0.1.x for Factorio 2.0 and 0.2.x for Factorio 2.1. Script-only, so it is safe to add to or remove from any save.
Why it exists
Factorio’s combat is a resource problem: ammo, turrets, walls, repair packs. There is no room in it for luck, and luck is exactly what makes a biter rush feel like a story instead of a spreadsheet. The Mysterious Stranger perk in Fallout: New Vegas is the best kind of luck, rare enough to be an event and dramatic enough to be worth telling someone about. This mod ports the feeling, not the mechanics.
What happens
- A ~0.5% chance per hit you land. Only damage caused by your character counts, and only against the enemy force, so turrets, trains, and friendly fire never summon him.
- The kill is yours. The target dies instantly and the credit, along with the kill statistics, goes to you.
- He announces himself, briefly. A stranger tips his fedora and vanishes floats above your character for two seconds, a sting plays, and a chat line confirms the visit.
- 60 seconds between appearances, per player. In multiplayer everyone gets their own stranger and their own cooldown.
Design notes
The odds are deliberately stingy. At half a percent per damage event with a minute of cooldown, a long biter defense might see him once or twice, which is exactly the frequency where a player still turns to say “did you see that?“. Configurable chance and cooldown, an actual trench-coat NPC who walks in, fires, and despawns, and a licensing-safe revolver sound are on the list for later releases; this one is the perk in its purest form.
Technical approach
The mod is a single control-stage script with no prototypes. It listens for the entity-damaged event, filters for a player-controlled character damaging the enemy force, checks that player’s cooldown, and rolls. On a hit it latches the cooldown first, so a burst of chained damage events from one shot cannot fire twice, then kills the target with the player as the credited cause, draws the flying text two tiles above the character with a fixed lifetime, plays a built-in utility sound, and prints the chat line from the locale file. Per-player cooldowns live in mod storage and are re-initialized on configuration changes, so adding or removing the mod mid-save is safe. Tooling matches my other Factorio mods: a Python preflight and packager build both release lines, a PowerShell script deploys to the local mods folder, and the film-noir thumbnail is a hand-authored SVG rendered to PNG.
Toward the mod portal
The listing is staged under Content with the Combat tag, for Factorio 2.0 through 2.1, with Space Age as an optional dependency. It is licensed All Rights Reserved with the source kept private. The art below is the portal thumbnail and its wide render: a fedora and an upturned collar against a streetlight halo.
