Link to mod page at my site: https://artisans-corner.com/shadow-magic/

"There is a dark secret hidden within the walls of Candlekeep, forbidden to be spoken of among the scribes and monks even in hushed voices. A well of shadow magic, fueled by darkness and loss, shunned by most practitioners of the arcane arts. Such powers originate from the realm of the Shadow Weave, the distorted mockery of Mystra's Weave created by Shar, the Nightsinger. So obscure is this power that most are unaware of its existence, and those that know of it refuse to acknowledge it due to its dark origins. However, the seductive whispers of this power has called to you, an apprentice mage who had barely mastered your first cantrip, since a young age, deep beneath the great library.

When the voices became too much to resist, you snuck into the depths of Candlekeep in the dead of night, where unwanted and dangerous secrets are left to rot. Inside of a once-sealed chamber stood a strange fountain, an open wound in the Prime Material Plane through which the energies of the Shadow Weave bled. As soon as you touched the eerie yet beautiful strands of magic that flowed from the wound, you felt an awakening as your connection to the Weave was severed and the power of Shar's dark Weave coursed through you in its place, bestowing upon you a magic that few are gifted with. As you matured, the growing magic within you developed a symbiotic connection until it became one with your very being, and the power of the Shadow Weave became subservient to your will. Gorion and your tutors grew wary of the strange magic that you wielded, though they never learned of the source. Though you knew the dangers of toying with Shar's domain were great, the temptation of such a little-known power in your hands were a thousand times worth the cost."

Component 1: SHADOW ADEPT

This is a mage kit with a completely unique spell selection with 100+ new spells to choose from. A lot of them are copies of existing spells but there are quite a few relatively unique ones in there.

A list of spells with screenshots of their descriptions can be viewed here.
SHADOW ADEPT: Shadow adepts hurl themselves into the abyss of the Shadow Weave, immediately acquiring all the gifts available to casual students and discovering secrets unavailable to all but the most dedicated. Advantages: - Hit Die: d6 - May use Shadow Magic. SHADOW MAGIC: Spells of the Shadow Weave are usually more powerful than regular magic, but drains the caster's life force. When a spell is cast, the shadow adept must make a save vs. death at +5 minus spell level (e.g. +4 for level 1, -4 for level 9) or temporarily lose Constitution equal to the level of the spell cast for 3 rounds. If the shadow adept's Constitution reaches zero, <PRO_HESHE> is killed instantly. The Shadow Weave is a mysterious and alien entity, far darker and harder to control than that of Mystra's equivalent. As such, a great amount of mental acuity is required in order to master shadow magic. High intelligence, wisdom and charisma benefits those who choose to stray into Shar's domain. - Gains the Darkvision innate ability. DARKVISION: The shadow adept is gifted with the ability to see in the dark even better than in light. <PRO_HESHE> permanently gains infravision and immunity to blindness. - Gains one bonus spell cast per level. - +2 bonus to saving throws against spells of the Enchantment, Illusion and Necromancy schools. - 4th level: May use the Shield of Shadows ability once per day. SHIELD OF SHADOWS: The shadow adept surrounds <HIMHER>self with a barrier of purpleblack force. This shield of shadows functions like a shield spell, setting <HISHER> armor class to 4 (2 against ranged weapons) and absorbing magic missiles cast at him for 1 hour per 2 levels to a maximum of 9 hours. From 8th level onwards, the shield of shadows also grants +4 to saving throws vs. death and +1 to all other saving throws. - 5th level: May use Shadowstep once per day. Gains one use every 5 levels thereafter. SHADOWSTEP: Step into the Shadow Plane and move for 7 seconds while others are frozen in time. The shadow adept cannot attack or use spells while in the Shadow Plane. - 14th level: May use the Shadow Double ability once per day. SHADOW DOUBLE: The shadow adept creates a copy of himself out of shadowstuff. The copy is at 60% of the caster's level and has all the spells and abilities that the caster would have at that level. Disadvantages: - -2 penalty to saving throws against spells of the Invocation and Alteration schools. - May not learn or use spells from the Weave. - Alignment restricted to non-good. Prime Requisites For Dual-Classing: Intelligence, Charisma

INTELLIGENCE WISDOM CHARISMA 1-2: -5 casting speed penalty 1: -50% spell duration, 50% spell failure 16: +1 level 1 spell 3-4: -4 casting speed penalty 2: -45% spell duration, 45% spell failure 17: +1 level 1 spell, +1 level 2 spell 5-6: -3 casting speed penalty 3: -40% spell duration, 40% spell failure 18: +1 level 2 spell, +1 level 3 spell 7-8: -2 casting speed penalty 4: -35% spell duration, 35% spell failure 19: +1 level 3 spell, +1 level 4 spell 9-10: -1 casting speed penalty 5: -30% spell duration, 30% spell failure 20: +1 level 4 spell 11-17: Nothing 6: -25% spell duration, 25% spell failure 21: +1 level 5 spell 18: +1 caster level bonus 7: -20% spell duration, 20% spell failure 22: +1 level 6 spell 19: +1 caster level bonus 8: -15% spell duration, 15% spell failure 23: +1 level 7 spell 20: +1 casting speed bonus 9: -10% spell duration, 10% spell failure 24: +1 level 8 spell 21: +1 caster level bonus 10: -5% spell duration, 5% spell failure 25: +1 level 9 spell 22: +1 casting speed bonus 11-15: Nothing 23: +1 caster level bonus 16: +5% spell duration 24: +1 casting speed bonus 17: +10% spell duration 25: +1 casting speed bonus 18: +15% spell duration 19: +20% spell duration 20: +25% spell duration 21: +30% spell duration 22: +35% spell duration 23: +40% spell duration 24: +45% spell duration 25: +50% spell duration
This mod is still unstable and has a few known issues:

• One level 9 spell has a side effect that requires party AI to active to take effect, as it depends on the dplayer3.bcs script. Once you've met the prerequisites (you'll understand once you see the spell) simply turn on scripts for the effect to kick in and then turn it off if you wish.
  
• Shadow Adept multi-classes will not gain Shadow Adept high level abilities.
  
• A couple spells are a bit glitchy here and there. Bug reports are welcomed.
  

Component 2: SHADOW MONK

SHADOW MONK: Little is known about the secretive order of shadow monks, other than the fact that they draw upon the power of the Shadow Plane to wield dark ki. They are masterful assassins, manipulating powerful illusions to their advantage and skilled at striking from the shadows, but their ritualistic training has taken a toll on their physical stamina. Advantages: - +1 bonus to Dexterity. - Gains the Darkvision innate ability. DARKVISION: The shadow monk is gifted with the ability to see in the dark even better than in light. <PRO_HESHE> permanently gains infravision and immunity to blindness. - Gains the Life-Drain innate ability. LIFE-DRAIN: Shadow monks channel the power of the Shadow Plane into their fists, gaining bonus effects based off of their level. 1st - 9th level: Drains 1 hit point on hit. 10th - 19th level: Drains 2 hit points and lowers target's strength by 1 for 2 rounds (save vs. death to avoid strength drain) 20th level onwards: Drains 3 hit points, lowers target's strength by 1 and 20% chance to drain one level permanently on hit - Has a backstab multiplier of x2. Increases to x3 at 11th level and x4 at 21st level. - 3rd level: May use the Shadow Pool ability. SHADOW POOL: Shadow monks wield the power of the Shadow Plane and can manipulate it in order to cast a limited amount of Shadow Magic. The shadow monk must first spend one round drawing energy from the Shadow Weave then cast the spell. The shadow monk's concentration may be disrupted during the channeling or the casting time. Level 1 (3rd, 6th, 9th, 12th levels): Shadow Missile, Blinding Darkness, Shadow Veil, Decoy Level 2 (7th, 10th, 13th, 16th levels): Dark Mirage, Black Mist, Ghostly Visage, Shadow Walk Level 3 (11th, 17th, 23rd levels): Shadowblast, Lifedrinker Touch, Shadow Comets, Impose Level 4 (15th, 21st, 27th levels): Fireshield (Shadow), Shadeskin, Summon Shadow, Shar's Blessing - 5th level: May cast Shadowstep once per day. Gains an additional use every 5 levels thereafter. SHADOWSTEP: Step into the Shadow Plane and move for 7 seconds while others are frozen in time. The shadow monk cannot attack or use spells while in the Shadow Plane. - 12th level: May cast Shadow Door once per day. Gains additional uses at 16th and 20th level. - 15th level: May use the Deathstrike ability once per day. DEATHSTRIKE: The shadow monk teleports to a chosen target and turns invisible for one round. <PRO_HISHER> next attack within one round is a guaranteed critical hit and drains six levels from the target. Disadvantages: - Hit Die: d6 - -2 penalty to Strength. - -4 penalty to Constitution. - Alignment restricted to non-lawful and non-good. - Uses the shadowdancer's high level abilities table instead of the fighter's, with the exclusion of Use Any Item. - May not use the Lay On Hands ability. - May not use the Stunning Blow ability. - May not use the Quivering Palm ability.

Component 3: ITEM PACK

This optional component adds a few relatively powerful items that are exclusive to the shadow adept. Some can be found in BG1+SoD and all can be found in BG2. Some items require the shadow adept to have a secondary class in addition to the kit itself. More items are being added as the mod is updated.

Spoilers on items and their locations can be found here.

Component 4: NPC REACTIONS

This optional component is intended to give extra dialogue with party members regarding the PC's use of shadow magic. Currently the only reaction that has been added is a single dialogue with Edwin.

Component 5: FAMILIARS

This optional component provides the shadow adept the ability to summon a familiar at 6th level. The shadow adept's familiar has a few differences in strength and function compared to a mage's familiar but mostly imitates vanilla familiar behavior.

Download the latest version here.