Keep 2 (Roar subsumed) up for damage buff & 4 up to distract some of the enemies.
Cast 3 to CC the enemies and then kill with 1 to produce Rubble. As long as you're killing it should be easy to maintain 1400 Rubble (so that 1 costs no energy). Use Naramon's Power Spike to maintain combo.
Spam epitaph for additional CC and to make it easier to kill enemies: https://overframe.gg/build/293248/
Must use a stat stick (weapon does not matter, just the mods): https://overframe.gg/build/293250/
Panzer is also helpful for status spreading and it's own self-revive. Other pets may require constant revives: https://overframe.gg/build/293253/