10 levels wont even be enough for much multiclass potential yet, would need 20 to make it more viable.
I'm assuming 11 or 12 levels for full release. Path to the Grave + Quickened Inflict Wounds (6th level slot) = 80 points of damage. Of course, I'll have to wait for Divine Soul Sorcerer and Grave Domain to be modded in
Of my 30 12th level builds, only 2 are single class. Most only dip into another class. But some, like my Half Elf Inflict Wounds build
Soul Hunter have 4-5 levels of a secondary class. One is a 6/6 split, a Githzerai Eldritch Knight / Forge Domain Cleric
Battle Tank. He has a 23 AC wearing mundane plate and using a mundane shield. Access to the Shield spell, makes it 28. He also has Heavy Armor Mastery and the Tough feat. That's a tank. I've been working on these builds since PAX.