1-2 Extra Chained Energised Hits and 2.5-10% Impact on Energised Hits.
35-50% Cleave on Hit. Stacks 5 times.
1-4 Burn Stack(s) on Critical Hit to a maximum of 3-12 Stack(s).
10-16% Toughness on Critical Hit Kill.
Disclaimer - I've not had a lot of chance to test this, but conceptually it works. I don't see why it wouldn't work on Damnation too.
Your role in this build is to delete anything your grenade can stick to. Any Flak, Carapice, or bosses should immediately have a grenade stuck to it.
These are mostly going to be personal preference. The Power Sword is good for cutting down small numbers of walkers, and Laspistol is nice to spam into small hoards/ranged shooting enemies like Gunners. Either can be substituted; the build exists to focus grenades.
Not super important - toughness makes the most sense for sustain but you can swap these out with health and wounds interchangeably. The only important perks on these are the revive speed, to improve your support utility.
Pretty much any perk with grenades mentioned is taken, bar Twinned Blast (10% is not a high enough chance to warrant a perk point). Picked out other perks geared towards mobility and toughness regen. The Iron Will and Confirmed Kill combination should keep you topped up if you're taking out a grand majority of Maulers and Ogryns. I've picked out no extra perks for Infiltrate because it's not really the focus. Leave No One Behind is picked out for Infiltrate specifically.
You should be playing fairly mid-ranged, behind any melee classes, keeping an eye out for anything which is a Krak target. Once you spot one, one of two things will apply;
Once you start taking out groups of Krak targets, like a mass of Maulers, or an Ogryn with some friends around it, you should start seeing grenade regen commonly, so long as you remain in coherency. Ammo Crates are your friends, and it's absolutely viable to throw one down when you desperately need some Krak.
Additionally, you should be keeping your eyes peeled for downed teammates. If you see one and you have a grenade in your pocket, throw one at your downed teammate (if they're surrounded), pop infiltrate, and stealthily grab the revive. The combo of Leave No One Behind and the res speed bumps from the Curios should make this easy to do.
