Interesting option.
I use to play with 20 hardpoints into Consume (with Goatman) and 20 softpoints into Bind Demon.
Core dmg:
20 ES
20 mirror
20 blade warp
4 prereq
Core defense:
20 blood oath (only hard points count) = 43% dmg reduction of all types
Core sustain:
1 syphon (-33% dmg and life/mana per kill = sustain even vs enemies without drain effectiveness)
2 prereq
Core demons:
20 soft points demon mastery (before cta to not lose one when BC expire)
1+ bound demon (you could want to reach 20 soft points to make it easier to find a demon as he always roll aura enchanted, but this is only useful once and it can be achieved with 1 hard point and gear swaps)
6 prereq (no consume yet)
This is leaving you with a few points left (depending on how much hard points you need to invest in demon mastery, and your current lvl).
For general PvM, using 2 defilers is better than consuming a goat.
So unless you plan on doing Ubers/ancients, you don’t even need a point in consume. You can dump remaining points in levitation mastery.
If you want to do Ubers/ancients, then add 1 to lethargy and 1+ to consume.
I’d still only put 1 hard point in consume, cuz it only gives 1% more ed than levitation mastery, but you’ll always benefit from levitation mastery and very rarely from consume (unless this char is dedicated for Ubers only lol).