Nether Breach
Quickstart
- Build and light a Nether Portal in the Overworld as normal.
- Stand within about 8 blocks of the active portal.
- Wait — within seconds you'll hear the portal travel sound and see reverse-portal particles swirl around the frame. A Nether mob has just crossed over.
- Be ready to fight! Piglins, Blazes, Wither Skeletons, and more will appear right next to the portal.
- To stop the flow, simply break the portal (remove fire) or move away from it.
Overview
Nether Breach makes active Overworld Nether Portals genuinely dangerous. Nether mobs can periodically "breach" through any lit portal that a player is standing near, spawning directly beside it in the Overworld. A second system also simulates Nether-side mobs physically walking into a portal and crossing over, just as players do. Both systems are rate-limited to keep your world from being overrun, but the area around a portal is no longer safe.
What It Adds
Nether Breach adds no new items, blocks, or crafting recipes. Instead, it changes the behaviour of existing Nether Portals:
- Portal Breach Events — periodic mob spawns near any player-adjacent Overworld portal, with portal particles and the portal travel sound announcing each crossing.
- Direct Nether Crossings — Nether mobs already wandering near a Nether-side portal can cross through on their own and emerge from the corresponding Overworld portal.
- Weighted Mob Pool — not every mob is equally likely to cross. Common mobs like Piglins appear most often; rarer threats like Piglin Brutes cross infrequently.
Breach Mob Pool (most to least common)
| Mob | Relative Chance |
|---|
| Piglin | Very High |
| Hoglin | High |
| Blaze | Moderate |
| Wither Skeleton | Moderate |
| Zoglin | Moderate |
| Magma Cube | Low |
| Piglin Brute | Rare |
(Zombie Pigmen and other Nether mobs may also appear via direct crossings.)
How To Use
Triggering a Breach
- Build any standard Nether Portal frame and light it with Flint & Steel.
- Stand within ~8 blocks of the portal in the Overworld.
- Breaches are checked roughly every 5 seconds. Each check has a ~55 % chance of spawning a mob, so expect a visitor every 10–20 seconds on average when standing nearby.
- A portal sound and swirling particles signal every crossing — you'll always know when something comes through.
Stopping a Breach
- Deactivate the portal — break the purple portal blocks (splash water, a projectile, or simply mine the obsidian frame). No active portal = no breaches.
- Move away — the breach system only targets portals that have a player nearby. Walking far enough away pauses spawning for that portal.
- Let the cap fill up — if 7 or more breach mobs are already crowding the portal area, the system pauses until numbers drop.
Abilities And Mechanics
Safety Caps
- Per-portal mob cap: Up to 7 breach mobs may exist near a single portal at once. No new mobs cross until the count drops below this limit.
- Direct crossing cap: At most 3 Nether mobs can directly cross per crossing cycle (~2 seconds).
- Portal cooldown: After a breach, that portal enters a cooldown of roughly 25 seconds (plus a random buffer) before it can produce another mob.
Mob Behaviour After Crossing
Breach mobs behave exactly like their normal counterparts — Piglins barter, Blazes shoot fireballs, Wither Skeletons pursue you, etc. They are standard Nether mobs that simply happen to be standing in your Overworld.
Direct Crossings vs. Breach Spawns
There are two independent systems running simultaneously:
| System | How it works | Frequency |
|---|
| Portal Breach | Spawns a weighted random mob near the Overworld portal when a player is close by | ~every 5 seconds |
| Direct Crossing | Teleports a Nether-side mob that is already near a Nether portal into the Overworld | ~every 2 seconds |
Progression And Strategy
Danger Management
- Keep a shield and armour handy near any portal you use regularly — a Piglin Brute or Blaze can appear with no warning.
- Build an airlock or waiting room around your portal with a door so you can contain or funnel mobs rather than letting them roam your base.
- Deactivate portals in built-up areas when not in use to prevent unattended breaches.
Farming Opportunities
- Set up a kill chamber around a portal to automatically dispatch incoming mobs and collect gold, blaze rods, wither skeleton skulls, and other Nether drops without ever entering the Nether.
- Because the breach mob pool is weighted, positioning multiple portals near your base gives you a steady supply of Piglins for gold bartering.
- Hoglin crossings provide a renewable source of leather and pork without needing a dedicated Nether farm.
Hunting Wither Skeletons
Wither Skeleton heads are notoriously rare. Because Wither Skeletons are in the breach pool, a portal farm in the Overworld gives you an alternative — and potentially safer — method of hunting for heads to summon the Wither.
