Just said how to fix the Ice Breaker problem in Trials as well. Year One weapons are banned from Trials. In a place where level advantages aren't enabled you will always run into Year One stuff. For example: Thorn, Ice Breaker (in Skirmish) and to a lesser extent Invective. Until they leave Year One stuff behind (Destiny 2 perhaps?) This will always be the case. Side note: I don't have an issue with Invective considering it's very slow regen time.