User blog comment:Pacpac1997/Possible New Debuff Kind: Hp Freeze/@comment-189.186.231.40-20120620091258

There's actually an item that does something like that, seems that nobody knows :

Executioner's Calling:  Unique: Inflicts target enemy champion with Grievous Wound, causing 50% reduced healing and regeneration for 8 seconds (20 second cooldown).

I usually make it when Im against a mundo or a sion