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function HandleAttack(attackid) -- The core script branch if attackid == 0 then -- Regular attack current_attack = "bones_attack" elseif attackid == 1 then -- ACT: Check current_attack = "special_check" end end

But what exactly is a "boss battle script"? Is it GameMaker Language (GML), a Lua mod, or a narrative flowchart? In this article, we will dissect the anatomy of an Undertale boss script, provide a functional breakdown of the code structure, and teach you how to write your own bullet-hell masterpiece.