Motto:
"Know that I am Razorclaw, that my reality is not yours, and while I share Tigerhawk's dual Spark and Vok heritage...
I am NOT he!"
Weapon:
Ion Particle Blaster
For those interested, here are my pics for each of the four Kreon Combiners, with the extra (blind-pack) members integrated:
Bruticus:

Predaking:
Superion:
Devastator:

A few key points:
I replaced the torso that the combiner arms attach to with one of the spare clear ones from the 2012 main sets. I was afraid of repeated transformations snapping those fragile ball joints.
I used the extra torsos and legs to make hands, pegging the weapons into the side ports that are usually used for wings or tires.
There aren't a lot of great ways to use the heads, and I think you kinda end up stuck with them.
Predaking's back guns were a pain, and I was able to use the extra combiner hinge to solve it.