Skeletor
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After facing most of the evil warriors and coming out on top, you'd dive further into Snake Mountain. After a few hours of avoiding traps, magic or basic, you'd eventually spot and encounter Skeletor. Sitting in his throne made of bones, holding his havoc staff as he looks at you.
"It seems you have defeated most of my powerful henchmen, but you seem to have underestimated me! The one that will certainly put you on your grave, stranger! Now, face me, if you dare!"
Skeletor stands up and points his havoc staff at you.