I've got an old build in my Dark Miasma guide, but for the demons themselves? Let me log in and tell ya what I just respecced into. This includes Musculature Radial T3:
Demonlings:
2 Nucleolus Exposure (Acc/Dam)
Sovereign Right A/D/E +5
End Redux +5
Soulbound Allegiance %buildup
Overwhelming Force damage/KD conversion
+121% damage
+90% accuracy
+75% end redux
Demons/Gargoyles
2 Nucleolus Exposure (Acc/Dam)
Sovereign Right A/D/E +5
Doctored Wounds heal/end
Doctored Wounds heal/end/redux (will swap this out later on for two H/E +5
Dam Resist +5
+117% damage
+90% accuracy
+74% end redux
+32% damage resist
+47% heal
Demon Price
2 Nucleolus Exposure (Acc/Dam)
Impeded Swiftness %smash
Ice Mistral's %cold
Superior Mark of Sup. A/D/E (attuned for set bonus recharge)
Superior Mark of Sup End/Resist/Regen unique (attuned...)
+117% damage
+90% accuracy
+50% end redux (so far he's doing well with this, it was either keep this or get rid of a proc and add End +5 if necessary, which it wasn't so far)
Hell on Earth
Call to Arms Acc/Rech
Plus the other 5 procs. Could move things around with the pets if you want less procs and or end reduction/heal/resist in the other pets to make this function better as a buff...)
I really hate having pets struggle for END on long fights and since I have no reliable way in Demon/Dark to manage the blue bar for pets, I make sure to up their END Redux. Particularly the T2 pets in most sets tend to blow through blue. Prince seems to mange well with his 50%.
Hope that helps!