his document, showing a number of unused spells from early versions of Diablo, was compiled by Ed, a site reader.   Thanks to him for the great work.  His words follow, with only a couple of notes by myself at the end.

Complete guide to the hidden spells of Diablo and Hellfire

I was sick of all the crap people made up when they saw an unidentified spell icon so I did some research on my own and found the truth to the hidden spells.

(NOTE: in beta version, Diablo had 6 spell books... even look in your Diablo manual on page #18: "using spells and skills".... there's a picture with the spell book open and 1..2..3..4..5..6..? yes, 6 books.

I'll write two values with a dash in between, the first is the book in which the spell appears in and the second is the slot the spell appears in, There are 5 books in diablo and 7 slots... Not 4 books, 5, and the fifth book is not completely disabled either.)

	Etherealize - (Page 4, 7th slot down.) • Can be re-enabled, intact in the d1.07 code, as with all other available versions. • Proof: has been hacked and continues to be hacked into staves and scrolls although books are useless since it cannot appear in the spell book. Wonder when blizzard will disable it? (hate cheaters) • what it does: a silver ring appears over a player's head... supposedly like mana shield but absorbs physical damage... lasting is time-based. • Reason for removal: balance (immunity) • Graphics for this spell shown below.  (The circle fits perfectly around mana shield.
	Blood Boil - (Page 5) • Used like apocalypse, for a brief period (comparative to length of time fire walls last) any monster or (pvp on) player that comes into the squares adjacent to the person who cast the spell will explode. • Fire based to my knowledge. • Spell icon intact, code removed, graphics removed. • Proof: beta version. • Reason for removal: unknown. • This icon was reused in Hellfire for the skill rage.
	Blood Ritual - (Page 5) • Kinda like reversed healing, hp into mana. • Magic based (like healing). • Spell icon intact, code removed, graphics removed. • Proof: beta. • Reason for removal: let's see the ratio of healing is something like 3:2 (hp:mana) so if you had an alternate spell with the ratio 2:3 then you would end up increasing both life and mana and end up INVICIBLE! • Probable debug: have reverse efficiency for blood ritual.
	Doom Serpents - (Page 5) • Think of "poison bolt" kills animals, not demons, not undead. • Special base (like holybolt). • Spell icon intact-- guardian icon! code removed, graphics INTACT!! • Proof: beta. • Reason for removal: holybolt and doomserpent... pick. (there are more animals then undead monsters). • Graphics for this spell: Your position
	Invisibility - (Page Five) • Duhhh? what does this do?? • Magic based. • Spell icon intact, code removed, graphics?? Gee I wonder what I look like when I'm invisible. • Proof: beta. • Reason for removal: unknown.
	Sentinel - (Page Five) • A big eyeball appears (in the style of golem) and fires streaks of fire (in the style of guardian). • Fire based. • Spell icon REMOVED, code REMOVED, graphics, some left... I can't remember what directory but in Diablodat.MPQ there were several files named "flame" or "newexp" (.cl2). • Proof: beta. • Reason for removal: humm, you have golem and you have guardian... if you also had this, there is no point of having all three and who would choose a still shooter over a moving shooter or a combat attacker to a ranged attacker?
	Runes - (Hellfire only) • Runes are actually SPELLS that can be hacked into scrolls and staves. That's why. • "READING" a rune is like "READING" a scroll. • Proof: I tried it but deleted the *.hif files after the experiment.

Hard core pre-alpha icons!!! • Apparently these were just preliminaries with no real purpose or name:

All the above info was sent in by Ed, and the words are all his.

In my opinion, these are the spells that were left the closest to functional.  Obviously Blizzard had quite a few spells in mind that didn't make the cut, with a potentially six-page spell book, so I would guess that there are quite a few other things that didn't get left on the Diablo cd.  One interesting thing to note is that the icon for Invisibility is in a Diablo II screenshot from the Sorceress' Lightning Skill Tree.  You can see it here, 3rd pic down the page.

So does this mean the Sorceress will have invisibility?  It's a possibility, but remember that her skill trees and icons are still very much subject to change, so they could just be using that icon as a place holder for now, or they might be using that icon but for a different spell.

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