Venthyr condemn says pick me pick me but with enduring blow I should be casting MS on CD to keep up colossus blow even in the execute phase. It doesn’t seem like a good fit for each other. So I guess it’s either go with signet or pick a new covenant eh?
it should feel conflicting because it has negative synergy for the reasons you stated/already know
for venthyr fury/sinful surge has good synergy, venthyr arms was good in s1, in s2 there’s not a great reason to play it
enduring is good for arms for any other covenant and can default except kyrian leggo obnox strong situationally so depending on content have both on hand