Garen understood well that no matter how strong the headquarters’ Red Team was, they were not the Black Sky’s Elemental Generals, and didn’t possess as much powerful empowered totems as they did.
A typical totem user’s strongest totem was his core totem, and there were very rare totem users that were able to nurture a second spiritualized totem. The difference between the Generals of the Black Sky and the others was that they possessed a special nurturing technique where the aberrated creatures would be devolved and cause a major loss. However, they themselves did have the strength that far surpassed a typical spiritualized totem user.
Each of them had the strength of at least two spiritualized totems. One was their own core totem, and the other was the empowered totem they possessed.
Each of them were of the same level as Beckstone, whom Garen faced in the manor. Since they had four of them, it meant that they had the strength of four Beckstones.