Formerly known as 50% of [[artist:The Dark Twins]], Cyriel is now part of the famous Hardcore/Gabber act [[artist:Rotterdam Terror Corps]] as [[artist:RTSier]]. He begun appearing at big venues near 2000, and became the regular MC of the act in 2003, when [[artist:MC R.A.W.]] was diagnosed a serious medical condition which only allows him to perform occasionally since then.