Egg Sac
A silk sac laid by a Cave Broodmother. It never spawns alone and cannot move or attack, but bursts into a few Cave Spiders soon after being laid.
New season rules · 0.168.0-season.11 · Not yet released on the live server
A separate city-siege use is live; see below.

- Base health
- 4 (2 hearts)
- Base melee damage
- 0
- Base movement
- 0 blocks/s
- Melee reach
- 0 blocks
- Attack interval
- —
- Melee wind-up
- —
- XP coefficient
- 1
- Body (W × H)
- 0.6 × 0.6 blocks
Season levels and rewards#
Health and all attack-damage values are species bases, not final damage. Health scales by 1.065^(level−1) and damage by 1.05^(level−1), also modified by server strength. Season elites multiply health by 2.5 and damage by 1.3 before additional elite abilities. Base kill XP is the coefficient × (2 + 0.4 × monster level), then modified by elites, server rates, damage contribution, level-gap reduction and weakness. Summoned helpers award no season XP.
Spawning & habitat#
Does not spawn independently. Created by summoning or splitting from: Cave Broodmother
Behaviour & abilities#
- Rooted in place; does not walk.
- Hatches into 2–3 Cave Spider after 6 s unless it is destroyed first.
Drops#
This form has no ordinary item drops.
These are unscaled base rolls. A quantity of zero yields nothing. Elite/area modifiers, bag space and applicable material limits affect the result; a kill is not a guaranteed drop.
Summoned/split forms are not independent natural spawns and do not use the natural-hostile seed roll; do not treat them as full natural encounters.
Strategy#
It is fragile: break it with a quick blow or an arrow before it heaves and bursts. It hatches even if the broodmother is already dead.
City siege vs wilderness#
This creature (or its summoned/split form) can also appear in the live city siege. The figures above are wilderness base definitions; siege strength, targets and loot use separate rules.
Version & sources#
Current test worktree 0.168.0-season.11, rules fingerprint 82befbc7bf99; not a committed release or a production launch. Images retain original render revision d7ffb19, not new screenshots. Server settings can change values.
Reference files: shared/mobs.js · server/wilds-mobs.js · server/wilds-play.js · shared/siege.js