Mulch is a term for ammo destruction in Crawl. Every time you fire or throw a unit of ammo, there is a chance that that unit will be mulched. The odds of this happening depends on the particular item used. Only ammo can mulch: other items, even weapons such as hand axes and clubs which are considered throwable, never break.
- Stones, Sling bullets, Arrows, Bolts: 12.5%
- Needles: 8.33%
- Javelins, Tomahawks: 5%
- Large rocks: 4%
- Throwing nets: N/A. Nets corrode when creatures struggle out of them and are eventually destroyed.
- Some brands also affect mulch rates:
Note that launcher brands don't affect mulch rates.
Prior to 0.16, steel ammo had a decreased mulch rate. Large rock mulch rate was increased in this version.
In 0.11, enchantment bonus was removed.
Prior to 0.5, enchantment bonus did not increase a unit of ammo's odds of survival.