Or a duration of 3 turns.

Ok. You are not Krax. You have 20 dodge and cast Blindness on Forest Drake. Initially drake has 93 Accuracy. So before blinding drake has 73% hit chance. After blinding drake has 27% hit chance. So Blindness cuts drake's hit chance in almost 3 times for 4 mana. Imho overpowered. 

Either way you get defensive, with Krax or a Custom Faction, that's not everybody.  Secondly, what is not mentioned was who was the caster and what level.  The drake's level. 

A lot of the time I'd argue that the drake should resist if you're lower level and even if you're his level should have some minor chance at it.   IMHO,  I'd look at the drake's resist values and what kind of mastery values champions have and tweak that.  To make it harder to cast on drakes and dragons.

I am thinking about changing it to do -5 Accuracy per turn. So you go blind over the course of the battle. That just seems more interesting.

It sounds like Sean can make a mod for a few people with a new ability/spell called "Blur".  Let's leave Blind alone in the real game.

While I agree that Blind is rather strong for when you can get it, I would rather see it left alone or go with Heavenfall's solution than see a fixed-duration of three turns. I would also rather not see a duration value which is tied to the number of Death Shards you control, as I think that much of the magic in this game is tied too strongly to shards and too loosely to the caster already - for this spell and most others, the caster only matters for whether or not the spell affects the target at full strength, half-strength, or not at all.

Personally, if I were in charge of changing it, I would have it (and other curse-type spells) have to make a check against spell resistance each turn (or maybe every several turns) in order to remain active on the target. Possibly also include a penalty for the effective spell mastery value or a bonus to effective spell resistance for each subsequent check. This would leave the caster as a more important part of the spell - that level 20 mage with a spell mastery of 100 when looking to curse your enemies than the level 5 novice with a spell mastery of 50, since the level 20's curses will usually stick longer and are more likely to apply (note: spell mastery values are made up, and do not represent actual in-game values). As things stand now, you only need to get lucky once with the level 5 novice and you have the same effect as you would have had with the level 20 mage.

I could also get behind a combination of my nerf to spell duration and Heavenfall's nerf to spell power.

I think a limited duration is the best option for balancing Blindness.  Keep it at -50% accuracy, and if you really want to be nice, give 10% of that missing accuracy back per turn, until it expires.  But for the love of god, stop nerfing every single spell just because it's good!  Warriors are boring to play

I like it!

I am fine with this spell as the way it is.  It's a good counter to super combatants, as we call them in Dom3. Single, super powerful units.  It's far from an I win with them, but it is a way to take some of their power.  Many powerful things have both a high resistance to spells and a high accuracy, it can be difficult to land a blind, losing valuable mage turns and mana.  Blind takes Death 2, So that limits it to about half a dozen champs on a large map if that? And if I take it on my Sov, than that means I am not taking something else.  I find it perfectly balanced.

You have to blind one unit at a time and they can resist, if it had a cooldown of 4 turns, that would make it worthless.  

The problem with those other spells isn't that Blind is so OP, it's that those spells suck.  Although Curse isn't too bad.  That can be pretty handy. and Without blind, Death becomes a pretty shitty path.  It's worth having blind because I have no access to healing magic.  Nerfing blind would really put the empires and death magic at a disadvantage to life magic, in my opinion.  

That is exactly the thing I was hoping you would say. Blind is carrying the spellbook. Sure Curse has a contextual use, but most of those spells are DOA. The others need a buff and Curse needs to not have a casting time. Mass Curse needs a casting time of 1, with a high mana cost. This whole spellbook needs some love. Especially the +1 Attack spell. It needs to be more expensive and more attack. 

We started out with a random bag of unbalanced spells. Then we went big, else we go home. Death never got the go big buff that other magics did. Now other spells are being reigned into a solid balance, but death still feels left out in the cold. I would add a few more curses to it and buff the really useless spells that require several deathshards. Wither for example should be -3 attack, -.5 per death shard. Berserk should be +3 Attack, +1 per death shard with a high mana cost. I could go on balancing everything, but that is why I have a balance mod.   The general concept is probably enough.

you are wrong

blind IS op, there is no arguing about this

its op in EVERY way, its cost is too low

its effect is too strong(basically its a shrink without a malus, and shrink is lvl 3 blind lvl 2)

its duration is too long

it is op, there cant be any logic argument against this

and you guys are wrong about death being bad too

lets examine them

-wither, this is vERY VERY strong late game in fact its only weakness is that its a level 1 death that is scaling so well late game, so not so useful early but very strong in war late game, maybe id move it to lvl 3 4

-infection dunno, potentially is super strong late game if you really can blind curse 1 guy and then move all that aoe, but it depends on bugs and usability

-berserk not so useful, usually not worth the mana cost

-curse very good nearly op late game

-graveseal very very good, in some situation op, the only problem is that its not self sufficient, this spell rely on having other guys to make it worth, but if you have the right setup is super strong

-drain life is the first nuke, its not so good as dmg and cost and cd but the addition effect is very strong, its cool to have but you cant play it like you would play a fire mage ofc

-dirge of ceresa is another super op spell, really after you have contagion dirge of ceresa is just useless to play

-touch of entropy is not balanced but seeing the goal they devs have for it its basically going to be the main nuke for death, its very good too

-mass curse is also decent in wars etc, not too much good because you really dont need to have all enemies cursed, cursed is super strong on a enemy of choice, having them all cursed is a small plus

combo spells are super OP

syphon strenght is good

soulburning is more good as fire mage, until other spells outscale it but its ok

horrific wail is very good aoe, still unsure if too much good or not but surely ok

contagion is so op it hurts probably the most op spell of the game

so basically there is not 1 death spells weak, and half of them need a severe nerf

blindness is just one of them