Let me explain this BS simply as far as I understood from what the OP trying to tell us lol:
You are so bored for no reason you want hell to come to you lol. First you focus on your "determination" to wish to go to hell onto the sharp object to turn it into "dimension cutter" to use it to cut the dimension to open a portal into hell.
After the portal to hell openned naturally hell's BS start to pour into the room making the reality inside of the room twisted into hell reality. That's why the teddy bear toy in the room turns into monster bear.
OP asks you, if you had opened a portal to hell what kind of sweet mother of Jesus monstrosity would happen in your room enough to make you throw holy water everywhere to ask which object in your room being turned into a monster would be the hardest boss to defeat. Considering every object in the room would turn into a monster, some would be piece of cake monsters to defeat but some would be bosses but one of them would turn into final boss monster lol.
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My brain has a special lobe to understand every BS in existence lolol.