Dwarf giant slayers and runic weapons
I don't have the Dwarf rule-book, but I thought that Giant Slayers(and Demon Slayers) were champions who could be attached to a unit of Troll Slayers. This means that as champions, they will have to follow the Rule of Pride and all have unique runic weapons.

I think the idea is you have a unit of troll slayers to soak arrows/give rank bonus and then add in 2-3 Giant slayers as champions to add more damage to the front rank.