Omen Stribog is a good Boss to farm for many things including the Luphilim’s Eternal Deck. Mastery Amulets like the Luphilim’s Grim Chain will give you health, 6% school specific resistance and a school blade.
Other notable drops include:
Crowns Gear like Seal Team Assault Helmet, Housing Items like the Polarian Well and Lydia’s Cold Table. Amber, Pets including the Floe Siren and Snowball. Mounts including Frostfang Tiger, Himoolayan Yak, Luphilim Wings, Owl, Snow Ram, White Stag, Winter Treant, WinterGlide Skates. There is a good chance of getting Gold Skeleton Keys, Artisan’s, and Master Socket Wrench.
Strategy: Eliminate the Sentinel first by stacking school-specific traps and Indemnity Feint. Do not use blades. It’s recommended to have a Fire school hitter, who casts Backdraft. Remember to use Shatter before hitting to remove all of the Sentinels shields. After defeating the Sentinel you can use blades. Stack blades and traps to finish the battle with an All-In-One attack.
Whenever it mentions critical it says %. Ex: when talking about the Mimic ring it says 84% critical instead of just plain +84. This occurs every time critical is mentioned. Could be misleading.