The spells are all lesser powers, so you can use them in your voice slot. Offensive spells have been given a magicka cost, while mobility (dash/dodge) spells have no cost. There is a "cooldown" of around 3 seconds, and this seems ingrained in Skyrim. If this bothers you, use a mod that removes lesser power cooldowns. These spells should be obtainable via either console command, the add item menu, or the Dawnguard magic vendor.

Mod permissions will be left open, so have fun with this and tweak it as you wish.

Added spells:

Vengeful Spirit - Similar to the Vampire's Bane spell, but affects the living as well as dealing about 400 damage. Costs a bit over 100 magicka to cast.

Howling Wraiths - Works like a 3 second cloak spell, deals high damage to enemies roughly within melee range, plus staggers. Also costs a little over 100 magicka.

Focus - Should prevent you from moving while you heal 999 health and stamina for 2.2 seconds, leaving you vulnerable. Costs about 50 magicka. Currently doesn't seem to stop movement, I think the issue was that I made speed multiplier 0 instead of like 0.01 or something. Too lazy to change it for Ver. 1.00 and I'm not sure I even know what the issue is either. As of 1.1 and 1.2, it paralyzes you instead.

Mothwing Cloak - Gain a huge burst of speed for 0.1 seconds, and some cool light FX. Basically just a dodge without scripts or animations.

Shade Cloak - Pretty much the same as Mothwing Cloak but slightly less speed, and you're ethereal so enemies can't damage you. Last's a little longer too I think, like 0.2 seconds.

Become Shade (v1.2) - Gain immunity to poison, zero fall damage, waterbreathing, and greatly increased enchantment magnitude/melee damage. However, become 250% weaker to magic. This is because creatures made of Void seem to be weak to the dream nail, so weakness to magic makes sense. No cost and you can use it at will, the only downside is magic weakness. Also, this should make you dark, like a Shade.

Weapons:

Knight's nail 1h and Knight's nail 2h - Basically just iron swords, BUT they have less weight, further reach, faster swings, slightly less damage (per attack), less stagger, and some mean crit damage, at about +50.

ALSO I made them both have the silver weapon material type. This means that they should in theory benefit from anything a silver weapon does, so better damage against undead, or being able to smith to higher quality.

These should be obtainable from vendors, they'll be more expensive though. They're better than iron after all. As a last note, some of these might be considered OP, but if you run any difficulty mods, it doesn't matter. I have a mod that triples the enemies I face, so it's still a challenge for me.

Charms (v1.2):

As of version 1.2, there's also charm rings. These all have zero weight, an armor rating, and should be smithable.

Dreamer's Shield - Spellbreaker. You need a shield to use this properly though I believe.

Grimm's Fire - Ahzidal's mask as a ring, this boosts fire resistance and fire damage, assuming you don't have a mod that changes what that enchantment does.

Grubberfly Something - I tried making it give you sword beams, but it doesn't seem to work.

Ring of the Void - Ebony Mail as a ring

Location (v1.2):

As of 1.2, the spells and nails are stored at Delphine's secret room, in a chest.