It appears you can get very high defense penetration from Detect Vulnerability. How much is enough for Cosmics and Rampages? I read that Dino has up to 40% resistance.
Follow-up question, is Warlord mod and Detect Vulnerability additive? So if you have enough from DV then a warlord mod is unnecessary. But a reduce resistance debuff can make a target's resistance go negative and you do extra damage?