Also, units with spell immunity are often immune to some of these special attacks as they are perceived to be spell strikes rather than Melee strikes.

Oh ok i thought that may have been what was going on. Hopefully they fix the text of the abilites so it doesn't read that it gives negative accuracy

Double strike should check to hit.  It's bugged.

Yeah, double strike can't miss (gamblers strike can, but that's because it uses another system entirely that we can't use for double strike).

Changing it would require a new feature to be added to the combat system (addition of a can hit check on spells), which I'm not going to do for FE (it would introduce its own bugs and issues so its not worth it for one ability).  Instead I'll update the desc to what it actually does and increase the cooldown.

Was playing today and Gambler's Strike seems to be working fine- i did miss with it a few times. Glad to know that Double Strike isn't bugged, was just confused about the wording of it. Glad to know cooldown will be increased for it...