The boss battle theme from Shin Megami Tensei IV. This game has a lot of specific boss themes, like mini-bosses, challenge quest bosses, VR battles, etc.\r
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But when this theme plays for the first time its when you meet face to face with the difficulty spike SMT is so famous for.\r
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This is one of my favorite 3DS games, Id recommend it to anyone that has a 3DS and wants a lengthy game filled with stuff to do.