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For those without access to the 3.0 MM, here are the osyluth's stats with some minor conversions to account for different systems in 3.5 (like DR).

Osyluth CR 6
LE Large Outsider (Devil, Evil, Lawful)
HD: 5d8 +10 (32 hp)
Init: +4
Str 21, Dex 10, Con 15, Int 14, Wis 14, Cha 14
Fort +6, Ref +4, Will +6
Speed: 40 ft.
AC: 17 (-1 size, +8 natural)
Melee: bite +9 (1d8+5) and 2 claws +4 (1d4+2) and sting +4 (3d4+2)
Space/Reach: 10 ft./10 ft.
Base Atk/Grapple: +5/+14
SA: fear aura (5' radius; Will DC 14 or affected by fear spell); poison (DC 14, 1d6 Str/2d6 Str), summon devils (1/day; 2d10 lemures 50% or 1 osyluth 35%)
SQ: DR 10/good, SR 22, know alignment (automatic against any creature they see-no save)
Spell-like abilities (CL 7th): at will - animate dead, charm person (DC 13), dimensional anchor (DC 16), doom (DC 13), fly, invisibility (self only), major image, suggestion (DC 15), wall of ice. Also greater teleport (self plus 501bs. of objects) at will at CL 12th.
Feats: Alertness, Improved Initiative [BoXM add Accept Attack, Iron Will, Multiattack]
Skills: Concentration +8, Hide +3, Listen +11, Move Silently +8, Search +8, Sense Motive +10, Spot +12

Obviously, the 3.0 osyluth is quite a bit less physically impressive than its 3.5 descendants. This is okay because the fun really starts when your party slays one or more dread osyluths.

Those of you using BoXM rules can round out the dread osyluth by giving it the rest of the 3.5 osyluth feats (Iron Will and Multiattack: changing its Will save to +8 and its secondary attacks to +7) and by granting them the oh so useful feat Accept Attack from BoXM II.
In the case of the dread osyluths, I don't recommend adding their Con score to their hit points. The purpose of these things is to let them be killed and use this as a lesson against the reckless opening of vault doors. For those using the time passes sidebars I further recommend that you only allow your PCs to be the ones who open this vault. Don't let it be Navanna or the Pactlords. Again, this is to teach your PCs a lesson in prudence.

So Rags, how'd it go last night?

Dude, I hate that when it happens. My group has had to be cancelled the last two times I've tried to run a session and each time was at the last minute. It's really frustrating to put in all the prep work and then be stymied like that.

Let us know when you get to play my friend.

They certainly could. However, keep in mind that the osyluths are Lawful Evil and as such they have some priorities: 1) Repel the PCs if they continue to attack. 2) Get all the still-hibernating osyluths up and running. 3) Secure their personal area (which works as part of #1) and make sure they are resealed into their vault. 4) Find out what's going on. 5) Either escape from the Banewarrens or (more likely) work to recover whatever magic they might find useful for their own ends.

The thing about the dread oslyuths is that they can become an Aliensesque nightmare if they go unchecked.

All of which are good reasons to take my advice on one thing: only bring the dread osyluths into play if it is the PCs themselves who open their vault. Let Navanna and the Pactlords be repelled by the difficult traps and locks. The dread osyluths are no laughing matter and they can quickly get out of hand if abused.

Possibly the best long-term thing to do with the dread osyluths is to let them eventually escape to the Reliquary and be taken in by Raguel and restricted in their movements by him. You can use them again later at higher levels.