Assassin

'kay...  I don't think that MMM is an abuse, because why can't Thieves know where to aim the MMM?  I mean, they should be able to.

Oh, and is the level 24 thing total for thieves, or just for the thief class?

The difference between ignoring saves and having a save at -4 is actually quite big.  25% chance for each effect.  That means that half of the time, it will be either Slow or Blind.  Which means that for... say... a  7 1/2 attack per round F/T, he will attack 22 1/2 times which means that he can actually Slow or Blind 11 people.  Those 11 people will   be Slow'ed, or Blind'ed, whereas with Power Attack, they still get a save.  Additionally, with multiple 'castings' of it, you can make it last quite a bit longer.

Arrows of Detonation can be acquired with the Tactics mod, which is actually quite popular.

*edit*  How about a Mage/Thief? Improved Haste on MMM, and you get 10 ApR.  Because you need to re-cast MMM somewhere, you will probably get about 26-28 attacks in total.  Which means 13 - 14 Blind or Slow'ed folks.

I think that my in-game description might be a bit unclear.    You see, the Crippling Strike HLA actually has a 50% chance of either Blinding or Slowing the target.

So, in reality, this gives you a 25% chance of Slowing the target, a 25% chance of Blinding it (these two are mutually exclusive) and a 50% chance of doing nothing at all. Also, this ability lasts for 3 rounds, while the effect on the FoA is active as long as the flail remains equipped, so I don't think it's really that unbalancing.

BTW, what area effect weapons are you reffering to?

I understand it perfectly.  A Fighter/Thief can have 7 1/2 attacks per round Imrpoved Hasted.  That means that he can either Slow or Blind (both quite devastating) 3 different opponents.  Realistically, using a Bow, he could disable 9 different opponents in 3 rounds, which is pretty much the whole battlefield.  Hell, even a pure Thief could do it with Tuigan's Bow.

'Slow or Blind is not devastating'  You ever seen a Blind enemy?  A Blind enemy doesn't attack you, because he can't see you.  Slow is almost as good, because they will now advance on you very slowly.  

Can it be chosen multiple times as well?

Area-effect attacks include Fire Seeds and Arrows of Detonation.  If they work with Greater Deathblow, I don't see why they wouldn't work with this skill as well.

The Crippling Strike ability, in passing, seems to be to me overpowered, at least the Blind and Slow part of it. 50% is a lot; people are already complaining about the Flail of Ages + 5, and that has 33% chance to slow. Imagine a Rogue/Fighter with that skill. He could blind the entire field with an area-effect weapon, then proceed to slaughter the whole place.

I would say make it only available to melee weapons (if it can be done), and make it a 50/50 of either Slow or Blind, both at a save of -2 to -4.

Good, good. Seeing as this is pretty much the only dl'able romance for a straight male, I could use the new flirts.