diff --git a/discord_rss_bot/extensions/hoyolab.py b/discord_rss_bot/extensions/hoyolab.py
index f2044dc..0f1abb3 100644
--- a/discord_rss_bot/extensions/hoyolab.py
+++ b/discord_rss_bot/extensions/hoyolab.py
@@ -16,7 +16,6 @@ import contextlib
 import json
 import logging
 import re
-import time
 from typing import TYPE_CHECKING
 from typing import ClassVar
 from typing import cast
@@ -103,36 +102,6 @@ def fetch_post(post_id: str) -> JsonObject | None:
 http_ok: int = 200
 
 
-# ---------------------------------------------------------------------------
-# In-memory cache for Hoyolab post data.
-# Key: post_id (str)
-# Value: tuple of (JsonObject | None, expiry_timestamp)
-#
-# Prevents redundant API calls when the same post is processed by both
-# ``process_entry()`` and ``modify_webhook()`` within a short timeframe.
-# ---------------------------------------------------------------------------
-_POST_CACHE: dict[str, tuple[JsonObject | None, float]] = {}
-
-#: Cache TTL in seconds.  Entries older than this are re-fetched.
-_CACHE_TTL_SECONDS: int = 300  # 5 minutes
-
-
-def _cached_fetch_post(post_id: str) -> JsonObject | None:
-    """Return cached post data if fresh, otherwise fetch and cache."""
-    now: float = time.time()
-    if post_id in _POST_CACHE:
-        cached_data, expiry = _POST_CACHE[post_id]
-        if now < expiry:
-            logger.debug("Cache hit for Hoyolab post %s", post_id)
-            return cached_data
-        logger.debug("Cache expired for Hoyolab post %s", post_id)
-
-    # Cache miss or expired — fetch fresh data.
-    post_data: JsonObject | None = fetch_post(post_id)
-    _POST_CACHE[post_id] = (post_data, now + _CACHE_TTL_SECONDS)
-    return post_data
-
-
 def _as_json_object(value: JsonValue) -> JsonObject:
     return cast("JsonObject", value) if isinstance(value, dict) else {}
 
@@ -179,7 +148,7 @@ class HoyolabExtension(FeedExtension):
         if not post_id:
             return {}
 
-        post_data: JsonObject | None = _cached_fetch_post(post_id)
+        post_data: JsonObject | None = fetch_post(post_id)
         if not post_data:
             return {}
 
@@ -233,7 +202,7 @@ class HoyolabExtension(FeedExtension):
         if not post_id:
             return webhook
 
-        post_data: JsonObject | None = _cached_fetch_post(post_id)
+        post_data: JsonObject | None = fetch_post(post_id)
         if not post_data:
             return webhook
 
diff --git a/discord_rss_bot/feeds.py b/discord_rss_bot/feeds.py
index 6de7b0a..e91d097 100644
--- a/discord_rss_bot/feeds.py
+++ b/discord_rss_bot/feeds.py
@@ -56,6 +56,9 @@ from discord_rss_bot.custom_message import replace_tags_in_embed
 from discord_rss_bot.custom_message import replace_tags_in_text_message
 from discord_rss_bot.extensions import auto_enable_extensions_for_feed
 from discord_rss_bot.extensions import run_modify_webhook
+from discord_rss_bot.extensions.steam import extract_app_id as steam_extract_app_id
+from discord_rss_bot.extensions.steam import get_icon_file_for_app as steam_get_icon_file
+from discord_rss_bot.extensions.steam import is_steam_url
 from discord_rss_bot.filter.evaluator import get_entry_filter_decision_from_reader
 from discord_rss_bot.is_url_valid import is_url_valid
 from discord_rss_bot.settings import default_custom_embed
@@ -1762,7 +1765,7 @@ def create_components_v2_webhook(
     )
 
 
-def create_embed_webhook(  # ruff:ignore[complex-structure, too-many-branches]
+def create_embed_webhook(  # ruff:ignore[complex-structure, too-many-branches, too-many-statements]
     webhook_url: str,
     entry: Entry,
     reader: Reader,
@@ -1839,6 +1842,20 @@ def create_embed_webhook(  # ruff:ignore[complex-structure, too-many-branches]
     if custom_embed.thumbnail_url:
         discord_embed.set_thumbnail(url=custom_embed.thumbnail_url)
 
+    # Steam feed: override thumbnail with the game's capsule image when enabled.
+    steam_thumbnail_file: WebhookFile | None = None
+    if custom_embed.show_steam_game_icon_in_thumbnail and is_steam_url(feed.url or ""):
+        app_id: str | None = steam_extract_app_id(feed.url) or steam_extract_app_id(str(entry.link or ""))
+        if app_id:
+            icon_file: WebhookFile | None = steam_get_icon_file(app_id)
+            if icon_file:
+                steam_thumbnail_file = icon_file
+                discord_embed.set_thumbnail(url=f"attachment://{icon_file.filename}")
+            else:
+                discord_embed.set_thumbnail(
+                    url=f"https://cdn.cloudflare.steamstatic.com/steam/apps/{app_id}/capsule_sm_120.jpg",
+                )
+
     if custom_embed.image_url:
         discord_embed.set_image(url=custom_embed.image_url)
 
@@ -1851,6 +1868,9 @@ def create_embed_webhook(  # ruff:ignore[complex-structure, too-many-branches]
     if custom_embed.footer_icon_url and not custom_embed.footer_text:
         discord_embed.set_footer(text="-", icon_url=custom_embed.footer_icon_url)
 
+    if steam_thumbnail_file:
+        webhook.add_file(file=steam_thumbnail_file.content, filename=steam_thumbnail_file.filename)
+
     webhook.add_embed(discord_embed)
     return webhook