Hey all, just completed the game with a solo wizard on PotD difficulty and wanted to share the build. Though most of it will probably be pretty obvious.
15 Might, 15 Dex, 18 Int, Rest 10
I suppose this is more up to personal preference, I typically just stick with a balanced stat spread.
3 Athletics ASAP
After that typically mix and match between Mechanics and Stealth with a priority given to Mechanics
Level 1 - Chill Fog, Fan of Flames, Slicken, Eldritch Aim
Level 2 - Bewildering Spectacle, Curse of Blackened Sight, Mirrored Image, Concelhaut's Corrosive Siphon, Vital Essence
Level 3 - Llengrath's Displaced Image, Deleterious Alacrity of Motion, Expose Vulnerabilities
Level 4 - Confusion, Essential Phantom, Minoletta's Concussive Missiles, Iron Skin
Level 5 - Call to Slumber, Llengrath's Safeguard, Ninagauth's Bitter Mooring, Blast of Frost
Level 6 - Gaze of the Adragan, Ninagauth's Freezing Pillar, Minoletta's Precisely Piercing Burst, Citzal's Martial Power
High Level Grimoires - Level 6 Spells
Winter's Woes (Noonfrost bookshelf, a single sorcerer patrols near it) with level 5 and level 6 Ninagauth's spells as well as Blast of Frost. It also has the level 6 spells Arcane Reflection and Piercing Burst.
Willbreaker (Sky Dragon grimoire) has Arkemyr's and Gaze
Minoletta's (Adra Dragon treasure horde grimoire) has Piercing Burst and Gaze.
The Leaves of Essence (Od Nua 11?) has Martial Power and Death Ring.
Weapon and Shield Style
Secrets of Rime
Arcane Veil and then its upgrade are what will keep you alive in the early game while you blast things with spells. A lot of times I would just drop armor all together and rely on my base deflection, with a small shield, and the veil ability to drop something within it's duration. Once you grab Mirrored Image your temporary deflection will be very high and most creatures will have a hard time landing consistent hits. I built primarily defensive, as damage isn't really an issue, and Secrets of Rime gave the most benefit to the higher level, harder hitting spells, as well as Chill Fog which is useful throughout the entire game.
Plate Armor (Backer to the right of Temple)
Fine Sword on first level of temple until you get Gaun's Share (there is a hidden cache on a drake skeleton in Black Marsh with Primal Flames, this allows you to give it burning lash immediately)
Blunting Belt (Blacksmith, buy after quest)
Minor Ring of Deflection (Bear quest)
Cloak/Ring of Minor Protection (Cloak in Cilant Lis, Ring random?)
Oaken Scarab Figurine (Hidden by the little middle group in Copperlane)
Iridescent Scarabe Figurine (Heritage Hill, Valtas Tomb)
Obsidian Lamp Figurine (Vailian Embassy in First Fires)
Ring of Deflection and Ring of Protection (Merchant in Copperlane)
Rotfinger Gloves (Cartugo in Ondra's Gift) [Massively important, used as the main way to debuff higher defense enemies, also your Essential Phantom has access to the casts from the gloves]
Sura's Supper Plate (Locked door in the right section, first floor of Cliaban Rilag)
Finreah's Grace (Doemenel Merchant on second floor)
Lilith's Shawl (Top Floor of the lighthouse)
Boots of the Long March (Far right in Dyrford Crossing, guarded by a pack of Pwgra, Menpwgra, and Forest Lurkers)
Sanguine Plate (Vailan Embassy Task, The Forgotten)
Blesca's Labor (Merchant in Hearthsong)
Purgatory (Archdruid in Blood Sands)
Cladhaliath (Lle a Rhemen) [Important] the only way I could get this item was by intentionally leaving a single mob or any amount you can safely not die to alive, then once you acquire the materials and answer the questions, lure that creature/creatures in the room and use figurine summons to stand on the floor icons, then just run up the steps to trigger the cutscene.
Girdle of Maegfolc Might (Leaden Key assassins in Stormwall Gorge)
He Carries Many Scars (Undead Raedric)
Broad Belt of Power (Random?)