This is a build for personal use, that follows the following rules:

1. Don't use Umbra or Aura Formas.
2. Don't use Hard-To-Get Arcanes (Eidolon, Arbitration, etc.).
3. Don't use Helminth.
4. Don't use mods I dislike like Combat Discipline.
5. Don't use unmaxed mods.
6. Build doesn't consider Archon Shards, I don't use any.
7. Build doesn't consider Operator School, I always use Zenurik, however.

Simple [Grendel Prime] build for general use and Steel Path on the side. Cast 1 and aim quickly at enemies around you to put them in your gut, also getting armor the more enemies that are in your gut. Cast 2 to get health quickly with enemies in your gut. Cast 3 to get health in an emergency where you don't have enemies in your gut, and also go very fast if you feel confident enough to control [Grendel] as a ball, don't forget to hold shift to go even faster and that you can double jump. Cast 4 to armor strip enemies in front of you if you have an enemy in your gut.

It's not the best build ever, but gets the job done.