When using Grave Touched and Form of the Dead if a Warlock makes and attack with a Greataxe (1 X D12) is the damage increased to 2 x D12.

Yes, you add only 1 extra roll to any # of rolls you make to determine necrotic damage.

So greataxe + hex: 1d12 + 1d6

You can choose 2d12 + 1d6

Or 1d12 + 2d6

Obviously everyone picks the higher die.

grave touched adds an additional dice for each hit

your eb hits multiple times on higher lvls.

you get an additional dice for every hit....

lv 6 2x 2d10+x instead of 2x1d10+x (2d10 extra dmg)

lv 11 3x 2d10+x instead of 3x1d10+x (3d10 extra dmg)

and so on

sounds kinda op

UA is usually broken.