[Raigen.Convict]

Personally the stat decrease skills should be able to stack up to 4 times but each stack lowers the accuracy of the hit for it by 10 on the second hit. Then doubles each stack. So first Flay is normal and gives -5 str. Flay 2 has -10 to hit and gives -10 str, Flay 3 gives -15 str and has -20 to hit, Flay 4 has -40 to hit and gives -20 str. And no two of these debuff skills apply to the same target.