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Malgus as of his second fight with Satele.

Sabers
Force
All out

I recall Kressh trumping Thanaton twice, but I don't think that's enough to put her above Malgus - at least for sabers.

What period do you reckon Malgus' unparalleled battle feats were performed in?

Malgus is better in sabers for sure, so wins that. Force and all out I'd say Kressh tbh. Her FL was potent enough to disintegrate Teneb Kel's lightsaber hilt in his hand when his blade was still absorbing it.