[Grendel Prime] is an absolute beast. With this build, we take advantage of all his strengths and use him as an amazing support damage tank.

We Helminth Aquablades over his 4, since they still do damage while you're in your Pulverize!

We use [Energy Siphon] since it's affected by Nourish, giving you way more energy. While you don't regenerate energy while in Pulverize, you still do outside of it, but more importantly [Energy Siphon] plus our Nourish allows allies to gain tons of energy passively as well.

We also use [Primed Continuity] to keep Nourish and Aquablades up for longer

This is a nice, simple [Grendel] build. Press 4, then roll around in a ball filling up your stomach and Nourishing when needed. Super Tanky, lots of armor strip, tons of damage from Aquablades. All in all, just something fun and nice to play around with.

Recommended Shards:
Shards here are really to taste.

If you intend to mainly use Pulverize, I would recommend Blue Archon Shards for Energy Max, or Red Shards for Ability Duration. (Which increases Aquablade duration and reduces cost of Pulverize.)

If you don't intend to use Pulverize that much, I would recommend Red Shards for Ability Strength.