The Void Blade

For an unknown reason, decades ago, The Void Blade, a blade made of solid obsidian fell from a hole in reality to a portal to the void. This blade has the ability to cut a hole in reality, creating a portal to the void. This ability can only be used with people that have a magic tier of 4 or higher, someone with a magic tier of 3 or lower cannot use this function of the blade. Every time you use this function you have to roll a d100, if you roll a 60 or below you gain a slight insanity, and every time after that first insanity, your insanity only grows more potent. This effect only occurs if you aren’t tier 6 in oblivion or death magic, and if you are tier 6 in either of those magics then this blade is just a normal sword for you that can cut holes in reality.