This will be extremely hard with champion fragments spawning.

Bring Ventari Revenants with Energy Expulsion spam to keep anomaly fragments away. Preferably keeping the tablet camped on the 2 legged Legendary Leyline Anomaly.

Get the peglegs for tight cluster/individual knockbacks

these are best for individual knockbacks - sends em FLYING

Get the Miner's Explosive Charges from Dianaa

THESE will keep them knocked down when spammed. theres a bit of a delay but youll get the hang of it.