(High Crit) is working in a general way. If High Crit is added as a property to a weapon it will roll one additional die on a Crit roll. Cool! But it seems this command can not be modified.
A dragon slayer weapon gives +2d8 on a crit or +2d12 if against a dragon. For now I made a power with a 1d8 damage and a 2d12 damage and have the player click on it. The problem is that gives extra 1d8 damage to dragons. I have to remove the High Crit so that wont happen. Any other suggestions?
https://i.imgur.com/eQ2ZTSy.png