The [Vasca Kavat] is the beast alternative to the augmented Dijin; thus it's number one job besides providing support is to keep itself alive. To that end the only attack option on this build is the [Draining Bite] mod, basically means that your Kat will stay by your side, where it's safe, and every attack it does launch will heal itself, ensuring it can pick you up if it goes down. While the Vasca is a delightful little Critty Kitty Draining Bite only does a pathetic 400 damage, and critting would not increase the health restored.
The two empty spots are for Link/enhancement mods of your choice, you can also swap out [Primed Pack Leader] if you like for another one, or perhaps shield [Regen]; however I prefer the Lifesteal Link to give the Kavat a quick pick me up when they pick me up.