The irreversible DoT on Thorn would be the same as Suros restore health with every round instead of having a chance to restore health on any round in the last half of the cartridge. There either needs to be a mechanic to remove the DoT's as every other PVP game that has them that I have played has or remove the DoT and change to something else. The 3rd option is make Suros the counter to Thorn allowing every round to restore health instead of a chance to restore health. However that doesn't balance against other weapons. The 4th option is make the Thorn DoT a random round in the chamber which forces a reload once it's used to use again. Even then though an irreversible DoT is unbalancing in any PVP game