Note: there's some confusion with this group as there are at least two typos in its FILE_ID.DIZ that were used in releases.

For example, in the Skunny Lost in Space DIZ, the group is misspelled as "Psychdelic" and is dated "01/07/93". However the PEI.NFO has the release date as "01/07/94", the group correctly spelt as "Psychedelic" and an elite BBS records it as being upload on the 17 Jan 1994. And this PEI.NFO release for One Must Fall has the release "02/13/93" but the file last modification date is 13 Feb 1994, yet the game was published in May 1993 and released by Ian's Rotting Corpse in June 1993.

PEI was a PC app cracking group, active in 1993 and 1994. A few of the senior leadership were also involved with Ian's Rotting Corpse.

A january 1993 nfo listed Sea Wolf, Celestial Wizard, Scionic Compound, Black Mage (senior), Blitzkrieg (courier coordinator), ZigZag, Smack Master G, Bill, Nixe, Massive Resistance, It, Imp Of Zamiel, PyschoNatric, WenchWomen, Death Pod, Sex Executioner, Lovely Carcass, Stink, Mr. Marlbaro, ChemGod, Clinken, Jubilant Reaper, ManCheZ, Analog Kid, Toxican, Zillion, Morpeen, Scorpion Kid, Living Stamina, Hard Case, Plaidman, Hell's Reject, Asp, Grand Adimral Thrawn, Leader Of The Pack, Dungii, Horrid Beast, Unholy Stench, Deadly Bran Muffin, Violent Child, Insane Prophet, Lars The Wild One, Overlord Krazen, Mr. Brownstone, Hand Of Death, Pathfinder, Bobastic Simpleton, Razor, Urick (members), The Explicit Mind, Nile, Pimpf, Morbid Apparition, Conspikuous, Eleet Boy, Iize, Oi, Blasphemous Tomato, Sheep Basher, The Repulsor, The Evil Witch, Lius Cifier, Vilainous Scumdog, Xing!, Druuna, Senterfuje, Eternal Imbecil and Captain Blood (spreading team) as members at that time.