Brother Viscus was a male Dathomirian Nightbrother who lived during the Clone Wars. He lived in the Nightbrother village on Dathomir, where he supervised the tournament in which Asajj Ventress tested Nightbrothers to determine who was worthy of becoming her apprentice.[2] Shortly thereafter, he and the Nightbrothers attacked Obi-Wan Kenobi and Anakin Skywalker when they went to the village looking for information about Savage Opress, who had been chosen as Ventress' apprentice and had killed Jedi. After the brief engagement, Viscus pointed the two Jedi towards Mother Talzin and allowed them to leave in peace.

Try to sound similar to the way he sounded, but he is such a minor character you are free to do your own take.

Example: https://youtu.be/HEHsWjCGGyk?t=22