Nullcore is a VIP Hack provider made by V952.
Nullcore is known as the CitizenHack of TF2, because a better and public alternative is available (LithiumCheats)
At first, they only had a Half Life 2 Deathmatch hack.
After a year or two, V952 ported it to Team Fortress 2 and added some magic aimbot prediction
It had many wars with LithiumCheats and Rud.