diff --git a/data/json/effects_on_condition/nether_eocs/nether_monster_death.json b/data/json/effects_on_condition/nether_eocs/nether_monster_death.json
index 9fb18e3bd572d..854d64f16da74 100644
--- a/data/json/effects_on_condition/nether_eocs/nether_monster_death.json
+++ b/data/json/effects_on_condition/nether_eocs/nether_monster_death.json
@@ -62,7 +62,7 @@
           {
             "case": 4,
             "effect": [
-              { "u_emit": "emit_fog_plume", "target_var": { "context_val": "death_loc" } },
+              { "npc_emit": "emit_fog_plume", "target_var": { "context_val": "death_loc" } },
               {
                 "if": "player_see_u",
                 "then": {
diff --git a/doc/EFFECT_ON_CONDITION.md b/doc/EFFECT_ON_CONDITION.md
index cdca9198fd9f1..d1581a41791bf 100644
--- a/doc/EFFECT_ON_CONDITION.md
+++ b/doc/EFFECT_ON_CONDITION.md
@@ -82,7 +82,7 @@ For example, `{ "npc_has_effect": "Shadow_Reveal" }`, used by shadow lieutenant,
 | mutation: "deactivated_eocs"                     | character (Character)       | NONE                        |
 | mutation: "processed_eocs"                       | character (Character)       | NONE                        |
 | recipe: "result_eocs"                            | crafter (Character)         | NONE                        |
-| monster death: "death_function"                  | killer (Creature)           | victim (Creature)           |
+| monster death: "death_function"                  | killer (Creature, if exists, otherwise NONE)| victim (Creature) | Note that if monster was killed without a killer (falling anvil, explosion of a bomb etc), EoC would be built without alpha talker, so using EoC referencing `u_` would result in error. Use `has_alpha` condition before manipulating with alpha talker
 | ammo_effect: "eoc"                               | shooter (Creature)          | victim (if exist, otherwise NONE) (Creature) | `proj_damage`, int, amount of damage projectile dealt. Detonation via SPECIAL_COOKOFF ammo effect return `proj_damage` as 1. Note that if projectile miss the target, EoC would be built without beta talker, so using EoC referencing `npc_` or `n_` would result in error. Use `has_beta` condition before manipulating with npc
 
 Some actions sent additional context variables, that can be used in EoC, in format: