Portals to Saqawal's Roost can be crafted via a beastcrafting recipe using the Saqawine Rhex beast and any three yellow beasts. Note that buying the Saqawine Rhex beast from other players and adding it to your bestiary WILL NOT unlock the portal recipe and grant access to Saqawal's Roost. Player need to unlock the recipe prior. However, beastcrafting is account-bound which meant it can be done in previous league.
Items found from this monster
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When defeated, the boss will always drop one of the above items. Einhar will also capture the boss, unlocking the Lua error: Error: invalid field alias "skill._pageName"; aliases cannot contain dots or quotes..beastcrafting recipe (add Lua error: Error: invalid field alias "mods.name"; aliases cannot contain dots or quotes.. suffix to a non-unique item). The captured boss is an ingredient for this recipe.
Note that fighting this beast boss again in the blood altar in the Menagerie will not drop another unique item.