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Kastiell is a five-piece post-hardcore band from Perth, Western Australia, formed in 2010. They blend technical guitar riffs, powerful vocals, and heavy breakdowns, drawing influence from the mid-2000s post-hardcore scene while adding modern elements for a fresh sound. Known for their high-energy live shows and technical skill, Kastiell has built a loyal fanbase both locally and internationally. They are dedicated to pushing the boundaries of post-hardcore music with emotionally charged lyrics and raw energy.