I updated to the latest version of L2jMobius OrcVillage files, and the GameServer indicated:
"SpawnData: Requested spawn for non-existing NPC: 26467 in file: KrofinNest.xml"
The boss of the Krofin Lv.110 instance was deleted in a recent update.
This fix applies the updated ID 26466 Krofin Queen Dark Krosha in the KrofinNest instance XML.
With this, the boss reappears inside the instance.
diff --git dist/game/data/instances/KrofinNest.xml dist/game/data/instances/KrofinNest.xml
index 70f1bccfdf9..54f098947b4 100644
--- dist/game/data/instances/KrofinNest.xml
+++ dist/game/data/instances/KrofinNest.xml
@@ -414,7 +414,7 @@
<npc id="26500" x="142395" y="240706" z="-6216" heading="17599" /> <!-- Queen Krosha -->
</group>
<group name="KROSHA_110" spawnByDefault="false">
- <npc id="26467" x="142395" y="240706" z="-6216" heading="17599" /> <!-- Queen Krosha -->
+ <npc id="26466" x="142395" y="240706" z="-6216" heading="17599" /> <!-- Queen Krosha -->
</group>
<group name="KROSHA_115" spawnByDefault="false">
<npc id="26487" x="142395" y="240706" z="-6216" heading="17599" /> <!-- Crismon Queen Krosha -->
https://eu.4game.com/en/patchnotes/lineage2/331/