Random Monster Ambush

Safe to uninstall anytime. Removing it just disables the features.

Ever feel like the valley is too peaceful?

Random Monster Ambush adds surprise monster attacks while you explore, turning normal travel into tense “watch your back” moments — especially at night.

Why you’d want this mod

Makes wandering around the world more exciting and unpredictable.
Adds danger without forcing you into dungeons.
Fully configurable so you can keep it light (rare ambushes) or go full chaos mode.
Pick which monsters can appear and when ambushes are allowed.

Features

Random ambush checks happen on a timer (configurable).
Spawns a small group of monsters around you (configurable max).
Optional Elite Boss ambushes (bigger, glowing, tougher).
Can be limited to nighttime only, or allowed during the day.
Can block ambushes indoors by default (recommended).
Monsters spawned by ambushes are cleaned up the next in-game day.

Configuration (GMCM Options)

Open GMCM in-game to customize everything.

General settings

Enable mod
Turns the entire mod on or off.
Check interval (ticks)
How often the game rolls for an ambush (60 ticks ≈ 1 second).Default: 120 ticks.
Ambush chance
The chance an ambush happens when a check runs (0.00–1.00).Default: 0.10 (10%).
Max monsters per ambush
Maximum number of monsters that can spawn in one ambush.
Minimum spawn distance
How close monsters are allowed to spawn to you (in tiles).
Maximum spawn distance
How far monsters are allowed to spawn from you (in tiles).
Allow daytime ambushes
If OFF, ambushes won’t happen before 6:00 PM.
Ambush start time
The earliest time ambushes can start (e.g. 1800 = 6:00 PM).If daytime ambushes are OFF, this will be forced to 6:00 PM or later.
Disallow indoor ambushes (default ON)
If ON, ambushes only happen outdoors (blocks all indoor maps, including modded interiors).
Skip during events & festivals
If ON, ambushes won’t happen during festivals, events, cutscenes, or minigames.
Skip ambushes while holding a fishing rod
If ON, ambushes won’t happen if you’re currently holding any fishing rod.

Monster types

These toggles let you choose exactly what can appear:

Green Slime
Dust Spirit
Bat
Rock Crab
Ghost
Skeleton
Squid Kid
Shadow Brute
Shadow Shaman
Serpent

(If you turn one off, it will never spawn in ambushes.)

Boss ambushes

Enable boss ambushes
Allows elite boss ambushes to happen sometimes.
Boss ambush chance
Chance that a successful ambush includes a boss monster.Default: 0.10 (10%).
Boss health multiplier
Multiplies the boss monster’s HP (2.0 = double HP).
Boss damage multiplier
Multiplies the boss monster’s damage (2.0 = double damage).

Elite bosses are larger and glow, so you can instantly tell it’s a boss.

Notes

This mod doesn’t edit game files (SMAPI mod only).
Works best with GMCM so you can tweak settings easily.
“Disallow indoors” is ON by default to avoid ambushes inside shops/homes.

F&Q:

Q: Do I need a new save?
A: No, you can add or remove this mod anytime.

Q: Do I need Generic Mod Config Menu (GMCM)?
A: No, but GMCM is strongly recommended so you can change settings in-game.

Q: Where do ambushes happen?
A: By default, ambushes only happen outdoors because “Disallow indoor ambushes” is ON.

Q: Can ambushes happen indoors (shops/houses/buildings)?
A: Yes—turn OFF Disallow indoor ambushes in GMCM.

Q: Why don’t ambushes happen in the Mines / Skull Cavern?
A: Those are indoor locations, so they’re blocked when Disallow indoor ambushes is ON.

Q: Can I allow Mines but still block other indoors?
A: Not in the current version, but it’s easy to add an “Allow Mines” exception option.

Q: Can I choose which monsters can spawn?
A: Yes—there’s a “Monster types” section in GMCM where you can toggle each monster on/off.

Q: How do I make ambushes rarer or more common?
A: Change Ambush chance (and/or increase Check interval to roll less often).

Q: What does “Check interval (ticks)” mean?
A: It’s how often the mod rolls for an ambush; 60 ticks ≈ 1 second.

Q: Can I make ambushes only happen at night?
A: Yes—turn OFF Allow daytime ambushes and set Ambush start time to the time you want.

Q: What is an Elite Boss?
A: It’s a tougher ambush monster that is bigger, glowing, and gets HP/damage multipliers.

Q: Can I turn bosses off completely?
A: Yes—turn OFF Enable boss ambushes.

Q: Can ambushes interrupt festivals, events, or cutscenes?
A: No—if Skip during events & festivals is ON, the mod won’t spawn during those.

Q: Does this mod edit game files (XNB)?
A: No, it’s a SMAPI mod only.

Q: Is it safe to remove?
A: Yes—monsters spawned by the mod are cleaned up automatically, and removing the mod won’t break your save.

Q: I’m fishing and keep getting ambushed—can I stop that?
A: Yes—turn ON Skip ambushes while holding a fishing rod.

Monster Valley - Random Monster Spawns and Boss Encounters