Level 2
Soul Sense
As an action, you can open your awareness to detect souls and their types. Until the end of your next turn, you know the location of any soul within a 12 unit ring around that is not behind total cover. You know the type of any being whose presence you sense, but not its identity.
Resistance
You’re resistant to necrotic damage.
Level 6
Necromancy Savant
Any Undead summoned or created by a spell that you cast gains a hit point maximum increased by an amount equal to your level + your proficiency bonus.
Level 9
Ethereal soul
If you are reduced to 0 hit points or are incapacitated against your will, you can cast Summon Ancestral Guardian as a reaction, and if you do so, you gain 1 hit point and you become immune to all damage until the spell ends. When the spell ends, you take 1 necrotic damage (this damage cannot be prevented). Once you casted the spell this way, you cannot do so until your next long rest.