The Physician

You've studied various ways to heal people giving you insight on how to best harm them as well.

Physicians touch

As a bonus action on your turn you may use the help action, use a healing potion, healers kit or make a wisdom(medicine) check to stabilise a creature.

Magical medic

You've studied magic to help you in an emergency.

 You can learn spells from the cleric spell list (you use the the arcane trickster's spell table to determine spell slots) wisdom is your spell modifier.

SURGICAL PROSCITION

As a student of humanoid anatomy you know precisely where to hit to do the most damage, when engaged with an enemy humanoid you can use your sneak attack even if you don't have advantage or an ally within 5 feet.

COMBAT MEDIC

When you roll dice to determine how much healing you do count any roll of 1-2 as 3.

SURGICAL STUDY

You can spend an action on your turn to study a non-humanoid creature for the next hour you can use your SURGICAL PROSCITION on creatures of the same type even though they're not humanoid.

DOCTORS IN SESSION

You share your cast knowledge of anatomy with your allies to help them hit vital points.

When you use the help action on your turn to give an ally advantage on their next attack your ally may add your sneak attack damage to their damage roll.