The War Mage's Pact of Apprenticeship

The Mentor spends one minute drawing a circle on a stone 5' wide. He places the incense in the center of the circle and lights it. A Spirit is drawn into the circle. The Apprentice joins the others in the Circle. The Mentor and the Apprentice lock wrists and the Pact is made. 

Mentor: I swear to teach you the ways of magic, to show you the mysteries of the Weave and her keepers.

Apprentice: I vow to endeavor to learn from your teachings and apply them to my own mastery.

The Mentor(Caster) forms a pact with a willing person. This pact confers a knowledge of the Mentors spellcasting ability, active spells and the feat Magic Initiate(Wizard or Warlock). A spirit is made the observer of the pact. If this Spirit is the familiar of the Master, it will be able to act as a familiar to the apprentice as well. Mentor and Apprentice can communicate psychically via the familiar so long as the familiar is within 100' of both parties. The familiar always defers to the master.

The Apprentice can either level up in wizard or warlock when they level up. 

The connection between Mentor and Apprentice requires concentration. When the Mentor is not concentrating on the Apprentice, the Apprentice cannot cast his mentors spells, however if the Mentor is focused he can grant his own spell slots to the apprentice to cast. Master and apprentice can use the Familiar as a relay, doubling the range.

The Apprentice casts spells at their own ability and proficiency, using their own spellcasting modifier.

The spell can be recast as an action when a pact already exists between the Mentor and the Apprentice.

If the Pact is broken or the Mentor forms a pact with a new Apprentice, the effects end for the prior apprentice and they lose the feat.