"Cleansing" Ritual

"Cleansing" (Dark Thaumaturgy ritual Level 3)
The greatest trick the Devil ever pulled was convincing the world he didn't exist, this ritual would allow the infernalist to use this trick to his own advantage. The infernalist may open a portal to the Abyss which would swallow the tracks of their infernal deeds.

System:
The infernalist shall spend 3 blood points in order to draw a pentagram, using their very own vitae. After the pentagram is successfully drawn, the infernalist may step into it and start muttering their prayers to their dark lords in order to open a portal between the dimensions. Every 30 of praying would allow the infernalist to make an extended Intelligence + Occult roll, each success would subtract a success from the perceiving roll. A fail means nothing happens this time, and the infernalist may keep going. A botch would shatter the portal, dealing aggravated damage (dices equal to the successes accumulated).