You might wanna adjust the numbers a bit. Compare the unupped version to Immortal, which is immortal without conditions, and has better stats for the same cost.
Yeah, that's what I looked at to begin with.
Lich vs Immortal
-1 | +2, same cost, immortality can be removed via PC.
Greater Lich vs Elite Immortal
0 | +1, -1 quanta, immortality can be removed via PC., and a single 5 HP heal for an extra 3

.
They're close enough that I don't want to fudge with numbers quite yet. Keep in mind though, that Lich can be improved by Nightfall | Eclipse, while to my knowledge, there is no buff for Immortal. Should that be taken into account with the original cost?