Eternal Blizzard Creatures 0.5.6
Minecraft 1.21.11 / Fabric / Java 21

Snow Explorer: Packed Ice for the Silent Altar
- Every Snow Explorer receives a guaranteed extra sale: 2 Emeralds for 4 Packed
  Ice, with 16 uses. This is the base price; normal villager price rules apply.
- Existing Explorers receive the offer when their entity loads after the update.
  Restart the world/server after replacing the JAR.
- Existing offers keep their order, prices, demand and used stock. The existing
  trade version is retained, so updating from 0.5.5 does not reroll books or
  remove the optional boss Sigil trade.
- If the Explorer already sells Packed Ice, that offer is kept. Repeated loads
  do not duplicate the trade or refill sold-out stock.
- The check runs during existing Explorer preparation/loading only. No new tick
  callback, entity scan, client rendering work or network protocol is added.

Ritual supplies
The current Silent Altar uses 8 Packed Ice around its stone-brick centre.
The Cracked Winter Sigil recipe uses another 4 Packed Ice. Three purchases supply
the 12 blocks required for the altar and a crafted Sigil, costing 6 Emeralds at
the base price. Other ritual and recipe ingredients are unchanged.

Installation
Replace Creatures 0.5.5 with this JAR on the server and clients. Keep only one
Creatures JAR. In singleplayer replace it in the instance's mods folder and
restart Minecraft. Existing Survival, Bosses and Atmosphere JARs are unaffected.

Verification
- One runtime class changed: SnowExplorerFeature. Its existing preparation
  exit calls one new helper; all original methods and trade-version fields are
  preserved. Every other runtime class, texture, tag and recipe is byte-identical
  to the exact 0.5.5 input JAR.
- 12 focused checks execute the patched trade helper and original sell/buy
  methods on isolated Minecraft fixtures. They check prices, quantities, used
  stock, existing book/Sigil preservation, repeated loads and customized sales.
- New game references were checked against Minecraft 1.21.11 intermediary
  mappings and the actual Minecraft classes. JVM/ASM checks and archive/JSON
  checks passed. No compiled test fixtures are included in the mod.
- No live Minecraft playtest was run here.

Build notes
This is a targeted update of the supplied compiled mod. Patch sources, the
readable helper reference and isolated tests are stored under
META-INF/sources/update-0.5.6/. Run the scripts from this conversation workspace
with the original 0.5.5 JAR in output/ and an extracted work/creatures-0.5.6/.
The patch tool uses the JDK's bundled ASM on Java 17 and preserves Java 21
runtime class versions. Runtime requirements remain Fabric 1.21.11 / Java 21.
