Idle Slayer - How to unlock the boss battle

Idle Slayer Gameplay (PC Game)

Bonus Stage, Idle Slayer Wiki

I bought all the online and offline items already and noticed this today. What's going on? : r/idleslayer

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Need Advise : r/idleslayer

Idle Slayer - SteamGridDB

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Stream Idle Slayer: A Casual Idler Game with a Lot of Depth and Replay Value from Quintin

How long is Idle Slayer?

Idle Slayer: Monster Quest RPG by Arvada Labs, Corporation