Abjurationist

You can use the power of your school’s spells to ward yourself against damage. When you cast an Abjuration spell of at least 1st level, you may siphon a portion of the spell’s magic to create an Arcane Aegis. The aegis lasts until the next time you finish a Long Rest and takes damage that would be directed at you. The aegis has a Hit Point maximum of two times your Wizard level + your Intelligence modifier; if the damage sustained exceeds the current Hit Points of the aegis, then you suffer any further damage once the aegis reaches 0 Hit Points, but the aegis still exists. If you have Vulnerabilities or Resistances to the type of damage being taken, apply these when calculating the damage taken by the aegis.

Any time you use a spell slot to cast another Abjuration spell of at least 1st level, the aegis regains Hit Points equal to the spell’s level times two, up to its Hit Point maximum. You may also use a Bonus Action to expend a spell slot and your aegis regains Hit Points equal to twice the level of the slot, up to its Hit Point maximum.

Once it has been created, you cannot create a new aegis until after you finish a Long Rest.

When you choose this subclass at 3rd level, add two Abjuration spells from the Wizard spell list to your spellbook for free. Both spells must be level 2 or lower.

At every level thereafter in this class when you gain a new level of spell slots, you may add one more Abjuration spell from the Wizard spell list to your spellbook for free. You may not choose a spell of a level for which you do not have spell slots.

You may use your Reaction to have your Arcane Aegis take the damage dealt to a creature up to 30 feet from you that you can see. If the damage sustained exceeds the current Hit Points of the aegis, the creature takes any further damage once the aegis reaches 0 hit points. If the creature has Vulnerabilities or Resistances to the type of damage being taken, apply these when calculating the damage taken by the aegis.

You always have the spells Dispel Magic and Counterspell prepared. When you use a spell slot to cast one of these spells, if you fail to stop an opposing spell, then you do not expend the spell slot.

You can also cast Dispel Magic as a Bonus Action, adding your Proficiency Bonus to the spell’s ability check.

You have Resistance to all damage from spells and you gain Advantage on any saving throw to resist a spell’s effects.