Got my final set of the first wave of the Kreon combiners, Kreon Devastator. Not having alot of green or purple legos in my house I picked up a Halo Mega Bloks "Covenant Banshee" set #19 for $5 clearance at walmart. I used whatever 2 peg black legos and 2 exhausts and some other parts from the kreon pack with cliffjumper and 3 vehicons.
I used most of what was in the set plus most parts of 2 blind pack constructicon Hooks. Made him a little beefier and had all six constructicons in this badboy.
Enjoy.