Pala "Threathen" & Night Lord "Frailty Curse" ignore def stack?

1) Paladin Threathen and Night Lord Frailty Curse Stack ? (-Def %)

help pls



(Paladin & Demon Slayer) Tested ... "wont stack" (because the buff at head , will covered the others)

(Paladin & Night Lord) .. . . .. pls help , (because threathen is buff at head , Frailty is "sumon"), will stack ? pls help..

Question Changed ,will the Threathen & DemonCry Stack ?

please help this , i no have NL friend to test...

The skill is Threaten, not Threathen.

I would assume they stack, but I don't have a NL either.

Frailty curse is a debuff, like demon slayer scream, not a summon