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diff --git a/homebrew/campaigns/The Devil Went Down to Avernus/sessions/11 - Avernus.md b/homebrew/campaigns/The Devil Went Down to Avernus/sessions/11 - Avernus.md
new file mode 100644
index 0000000000000000000000000000000000000000..d6abbe97f5512d00725d57214afc11ec2b3b84bd
--- /dev/null
+++ b/homebrew/campaigns/The Devil Went Down to Avernus/sessions/11 - Avernus.md
@@ -0,0 +1,6 @@
+- [ ] Shummrath
+- [ ] Sibriex
+- [ ] Hellwasp nests
+- [ ] Haarveg
+- [ ] Weslocke
+- [ ] Bathym

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diff --git a/homebrew/locations/Avernus/Haarveg's Hill.md b/homebrew/locations/Avernus/Haarveg's Hill.md
index 875bf0a910790310870aab946c6ae6ed5562947d..bd6b7d9837fc3c5e14a39e0d52970ac8fcbf3ae1 100644
--- a/homebrew/locations/Avernus/Haarveg's Hill.md
+++ b/homebrew/locations/Avernus/Haarveg's Hill.md
@@ -8,3 +8,5 @@
 
 Cutting him down results in 20 stirges (5 groups of 4) attacking the group.
 After round 1, Haarveg (a narzugon directly under Bathym) swoops in on his nightmare.
+
+Not cutting him down will result in the part being able to prep for the fight.

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diff --git a/homebrew/locations/Avernus/Sibriex.md b/homebrew/locations/Avernus/Sibriex.md
new file mode 100644
index 0000000000000000000000000000000000000000..d260660c99fbc200c884e418dbf9f669d964b90c
--- /dev/null
+++ b/homebrew/locations/Avernus/Sibriex.md
@@ -0,0 +1,18 @@
+> Spiky chains lash a fifteen-foot-diameter, floating blob of quivering flesh to a 20-foot-tall wrought-iron scaffold. Two fiends wrapped in chains stand atop the scaffold, torturing the bloated creature's flesh by tightening its chains. Demon ichor oozes from its wounds, forming a shallow pool around the scaffolding.
+>
+> A third, jackal-headed fiend uses a bronze horn to yell loudly at the bloated prisoner in multiple languages. It sits cross-legged about half-way up the scaffolding.
+
+All three fiends are immune to the sibriex's Warp Creature power.
+In the pockets of Fetchtatter's bile-stained robe are two potions of greater healing and six soul coins. The arcanaloth also carries a grimy spellbook bound in chasme flesh. Fetchtatter's spellbook contains all the spells the arcanaloth has prepared.
+
+Each chain has AC 19, 33 hit points, a damage threshold of 10, and immunity to fire, poison, and psychic damage.
+
+Fetchtatter offers 3 soul coins to get the Sibriex to talk, wanting to know about Weslocke so he can kill her and take her position.
+
+The Sibriex offers information in exchange for its freedom. 
+It knows info about Weslocke, Bathym, or other Avernus locations.
+
+Fireball
+Wall of Fire
+Dimension Door
+Counterspell