Ilrusi
Pretty simple one. There is an npc who is looking for a ring. The mobs around the area are easily soloable (I killed a few kraken as 75 nin). The ???s around the area enable the NPC to give you hints to where the ring is. One hint will tell you who is closest to the ring, while the other one will tell you which direction it is. To find the ring the npc has to be standing on top of the exact location, and when you talk to her, a ??? will pop.
Leujaoam Sanctum
This one is really fun. Sadly we lost because we had no idea what to do, but it was still fun. When you start out, the immortal npc will give you a special power, but will also give you a huge disadvantage along with it.
We got optical grafts (which I assume gave us a huge accuracy boost), but we got our attack cut in half. You have to find 3 lamia, they are together. They aggro and link by sight. Prosector is blm (you want to kill this one first), Bowyer is rng, and whatever the last one was something else. I don't remember. The mobs are pretty easy but they take a while to kill. Also, they were very difficult to sleep. Our blm managed to sleep one once without elemental seal, and our bard got resisted every time.
After you kill those 3, you get your next power/weakness. The second one was a huge attack boost (75 nin, my attack was around 950), but a very detrimental slow effect. Utsusemi: Ni recast time was almost a minute and a half, not to mention the major reduction in attack speed. From what I remember you only had to kill 2 mobs with this power.
After those mobs are dead, you get raptor grafts, making you run faster than flee speed consistantly. The weakness is your hp gets cut in half. The blm said he had chainspell. Unfortunately this didn't really help us because there were no mobs to fight. This part was sort of bugged. At some point, the npc just started giving us the same power bonus over and over, maybe 3 times. Then after a few seconds, she gave us our next power. We didn't even fight anything.
I'm not quite certain what the next power boost was. I believe it was a magic attack boost bonus, with MP -50% penalty. At this point we only had 5 minutes left so we assumed after we killed the last 3 mobs it was over. Unfortunately, after we found the mobs and got everyone there, we only had 1-2 minutes left so we killed off the last 3 really fast, hoping it would end, but she gave us another power again. I think it was the attack boost power, but I don't recall since we got kicked out of it soon afterwards. Someone in my group said that it mentioned something about the 3 we killed being the last group, but we still ended up losing.
All in all, it was probably the most fun assault out of all the ones so far, but I'm not sure if it's bugged since we didn't have time to win or anything.