I don’t want to wear out my welcome here, and this may be the last thing I post to this thread. There are a lot of reasons this build is a great one to play solo, that Not So Clever Hound hasn’t mentioned.
First off, the minute you hit Neketaka after launching your ship, you are level 5 or 6, and you have money from Berath’s Blessings, you can buy the two main items that make this build work: the Grimoire of Vaporous Wizardry and Rekvu’s Fractured Casque. (If you spent points on the Unique Merchant, “Well-Traveled Supplier,” you got some other items at 50% off in Port Maje; do get a Necklace of Fireballs, they help you through level 8 at least.)
Second, even if some of the full build doesn’t come until late in the game (buffs from Outcast’s Respite, the Giftbearer’s Cloth from Fampyr’s Crypt, etc), this build is plenty sturdy and the best part, it’s “‘very forgiving.’”
Once you get to level 14 or so, which doesn’t take long in solo play, you can make some of the mistakes I made, and still mop the decks with your foes if they are not way above your level: (1) explore dungeons with a torch, and forget to change back to sword and shield when the fight starts (didn’t notice the difference); (2) go into battle with your thieving gear still on (Burglar’s Gloves, Boots of Stealth, Mirrorback Cape or the later one) and never know it until the fight is over; (3) buff your skills with a Luminous Adra Potion and forget to re-injure yourself, then board Oheiro to fight about 3 wizards, a couple of priests, some rogues and chanters and fighters, realize that you were interrupting yourself with the Vaporous grimoire, and you still annihilated about 18 tough Rauatai defenders (after your crew was knocked out in the first 20 seconds).
Maybe like me you’ve played a solo monk with all the monk gear, a solo wizard with Sun & Moon and Ninagauth’s Teachings, and you’ve done all kinds of party play — give this one a try, and you won’t regret it.