How to maintain a 100% enfeeble

[Accidental Teamplay]

With a 100% enfeeble, any afflicted monster will deal no damage. Not with attacks, not with abilities. Some afflictions applied by the monster will have no actual effect, including Weakened, Enfeebled, Bleeding and Impaired.

It will not affect the duration of effects like Stasis, Frozen or Silenced, so it doesn't make the monster completely harmless. Anyway, here's a simple recipe for causing and maintaining such a debuff.

Causing the debuff
Get a beguiler/whatever to level 9. Learn Blinding Light and Song of Triumph. Get 8 dexterity. Use a dexterity weapon, so that Song of Triumph scales with dexterity. Wear a Flash Powder Reservoir ring (30% empower for Blinding Light). You can get one from Jaarus for finding out the fate of his sister or buy one from Kel in Cahlabrok.

This will put Blinding Light's enfeeble at 100%. Probably a rounded number, but the important part is it's rounded down in that case, because monsters do no damage at all. But, Lord Crab, it only lasts three seconds...

Maintaining the debuff
This is extremely simple: Draconid Mace. This is dropped by the Reaver captain in Silver Drift Hollow, and you can kill him as soon as you have the Vinculum (even though the bounty board is a bit slow with telling you to, but you don't need the quest).

The mace says it spreads afflictions from your target to nearby enemies, and that is true. For that purpose, it's not all that exciting as it doesn't spread all that far. But, what I noticed is that it also extends all afflictions on the target with each swing. It keeps adding and adding duration, which means that after a bunch of swings it doesn't even matter that the monster can still stun you, because the enfeeble will outlive the stun, and then you're back there swinging again.

It will add duration to afflictions even if the mace wielder wasn't the one who applied them.

"So I'll let my beguiler use the mace so that the entire enfeeble job is handled by one person."
The mace is a strength weapon, so if you put it in your main hand it will make Song of Triumph scale with strength instead. If you're going to use it on the beguiler, either dual wield it with a dexterity weapon in the main hand, or get 8 strength and main hand the mace. It already requires 6, so not like there's much left to go. Or you can just get 9 dexterity to make Blinding Light itself a little stronger, enough that you don't need the "perfect" empower aura.

Or, if you're not obsessed about exactly 100% enfeeble, you can main hand the mace with 6 strength and 8 dexterity and still reach like 98% enfeeble. Also, there are other ways to empower you beguiler than the aura, but this felt simple enough. So while we're being simple, you might want to just let someone else use the mace =)

Notes
If you apply a weaker enfeeble first, it will look as if you wasted Blinding Light, but the monster info window isn't reliable. It will sometimes look as if whatever you apply first is merely refreshed by whatever you apply later, which can also make you believe you can keep up Blinding Light by swinging with a necromancer's Withering Touch, but that's not how it works.

I believe the mechanic is that if you apply multiple enfeebles (or impairs, or weakens, etc) on a monster, the game will keep them all in mind and invisibly apply them all but only let the strongest one work. After the strongest one expires, it will let the next one work if it hasn't expired. Either way, the info window isn't reliable.

The better way to check is, if the monster is swinging at you and you're not blocking, absorbing, invulnerable or at 100% resistance but still taking no damage, the enfeeble is 100%.

Scratch that, I still have no ♥♥♥♥♥♥♥ clue about the logic involved. Withering Touch can overwrite it.

Also: Just like your enfeeble makes monster enfeebles weaker, if they enfeeble you first, your 100% enfeeble will not be 100%.