5-8% Strength for 4.5s on Kill. Stacks 5 times.
5-8% toughness on Chained Hit.
Your Grenades stick to Ogryns and Monstrosities. 6-15% Damage vs Ogryns and Monstrosities
5-8% Strength for every shot fired during continuous fire. Stacks 5 times.
Take rock and its subnode instead of box nades for most use cases - the group I was playing in needed me on box nades for clutch revive crowd-control moments. Rock will suit most better for dealing with specials. I would probably ditch the +15 toughness node under Strongman to allow for Rock's subnode.