Spellcasting. The mage is a 15th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks). The mage has the following wizard spells prepared:

Cantrips (at will): fire bolt,  mage hand

1st level (4 slots): detect magic, mage armor, magic missile, shield

2nd level (3 slots): misty step, dragon's breath

3rd level (3 slots): counterspell, fireball, fly, water walk, blink

4th level (3 slots): greater invisibility, control water, polymorph, stoneskin

5th level (2 slot): cone of cold

6th level (1 slot): tenser's transformation

7th level (1 slot):

8th level (1 slot): dominate monster

Arcane Deflection

At 2nd level, you have learned to weave your magic to fortify yourself against harm. When you are hit by an attack or you fail a saving throw, you can use your reaction to gain a +2 bonus to your AC against that attack or a +4 bonus to that saving throw.

When you use this feature, you can’t cast spells other than cantrips until the end of your next turn.

Tactical Wit

Starting at 2nd level, your keen ability to assess tactical situations allows you to act quickly in battle. You can give yourself a bonus to your initiative rolls equal to your Intelligence modifier.

Power Surge

Starting at 6th level, you can store magical energy within yourself to later empower your damaging spells. In its stored form, this energy is called a power surge.

You can store a maximum number of power surges equal to your Intelligence modifier (minimum of one). Whenever you finish a long rest, your number of power surges resets to one. Whenever you successfully end a spell with dispel magic or counterspell, you gain one power surge, as you steal magic from the spell you foiled. If you end a short rest with no power surges, you gain one power surge.

Once per turn when you deal damage to a creature or object with a wizard spell, you can spend one power surge to deal extra force damage to that target. The extra damage equals half your wizard level.

Shapechanger

At 10th level, you add the polymorph spell to your spellbook, if it is not there already. You can cast polymorph without expending a spell slot. When you do so, you can target only yourself and transform into a beast whose challenge rating is 1 or lower.

Once you cast polymorph in this way, you can’t do so again until you finish a short or long rest, though you can still cast it normally using an available spell slot.

Master Transmuter

Starting at 14th level, you can use your action to consume the reserve of transmutation magic stored within your transmuter’s stone in a single burst. When you do so, choose one of the following effects. Your transmuter’s stone is destroyed and can’t be remade until you finish a long rest.

Major Transformation. You can transmute one nonmagical object—no larger than a 5-foot cube—into another nonmagical object of similar size and mass and of equal or lesser value. You must spend 10 minutes handling the object to transform it.

Panacea. You remove all curses, diseases, and poisons affecting a creature that you touch with the transmuter’s stone. The creature also regains all its hit points.

Restore Life. You cast the [Tooltip Not Found] spell on a creature you touch with the transmuter’s stone, without expending a spell slot or needing to have the spell in your spellbook.

Restore Youth. You touch the transmuter’s stone to a willing creature, and that creature’s apparent age is reduced by 3d10 years, to a minimum of 13 years. This effect doesn’t extend the creature’s lifespan.

Keen Senses

You have proficiency in the perception skill.

Fey Ancestry

You have advantage on saving throws against being charmed, and magic can’t put you to sleep.

Dagger. Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.