1. The Caverns:
They are fun but IMHO could take a higher monster density. Just to make sure that ppl who aim to do the quest at least have a theoretical chance to beat the event when they reach the VotM.

2. Ithilthum, Valley of the Moon:
Here we go. Since I already had an idea whats going to happen, I was scared like hell by the actual layout of the map. It looked like pure suicide: The portals are directly on the island and there is absolutely nothing to break LoS! I did take quite some time wandering around, planning and looking for good spots to place my AoE spells. Luckily the monster density didn't turn out to be as dramatic as I feared (and had in mind when suggesting this), but I soon noticed that everything ignored me but directly charged/casted towards Limmir. Keeping him alive through the entire event seemed impossible so I quickly phased doored him behind some trees (just a bit south of the stairs). It turned out this made the whole event cheesy, but I can't imagine any character without PD 5 / TP 5 winning the event.
So, why was it cheesy after poting him? I took my defensive position outside the lake between the moonstone and Limmir. I figured I had to intercept everything coming from the island toward Limmir. That was how it worked in the first place too. The demons walked towards the moonstone and as soon as they reached it, they headed in my direction (not sure if Limmir or I was their initial target). However, since they first walked to the stone I had a couple of free turns. In addition to my AoE spells only few even survived that long.
It began to become *really* cheesy, when one of the major demons casted "darkness" and the whole island went black. At this point the demons just stopped moving as soon as they reached the moonstone (or the bunch of demons already surrounding it). A "sense" every few dozen turns combined with vapor and inferno eradicted them without any resistace.
3.: The Corrupted Balrog:
His invisibility is crazy. I didn't even see him once. I just notice something nearby (4-5 grids) shooting at me and I shot back in that direction, incinerating everything that may have been roughly in this direction. It worked out the way I did the event, but I bet you are in severe trouble if something impossible to see nor detect just walks past you and shreds Limmir before you know whats going on.
Even this way, this may have happened to me if I wouldn't have kept up the AoEs going since I knew that the last couple of turns something big should appear. I don't know if he would have ignored me if I a) wouldn't have damaged him before or b) wouldn't have stood nearly directly in his path towards the far away and out of LoS Limmir...
Conclusion:
The event is fun and I'm very happy to see it implemented, allthough the event didn't turn out quite the way I imagined when I posted the proposal.

However, I really doubt it's possible to beat if you can't teleport Limmir away. Means: everyone except archmages and shadowblades are in severe trouble. Not because the demons are too difficult but because they simply kill him off.
Proposals for improvement:
1. (minor): Right now the event directly starts when you use the scroll of summon. It would be nice and add some flavour if thats changed. When Limmir arrives you have to talk with him and he tells you something like
2. (major): As already mentioned, the way the event works now it looks pretty much impossible to keep Limmir alive without teleporting him somewhere safe. Thats why I mentioned in the original proposal to add some LoS breakers to avoid "collateral death" of the jeweler. In addition I had something in mind that resembles more a tactical defense event instead of "They come from all sides and either you kill em fast or they wipe you out"."Yes, this is the right place. I can feel the power radiation from this stone, but it somehow... feels... wrong. Corrupted! The demons you have fought on your way here must have tainted the once pure moonstone! I know a rite of cleansing but it will take some time to perform. And there a greater evil may be lurking below...
You must protect me while I concentrate on the rite of cleansing! Tell me when you are ready."
<Begin, I am ready to protect you with everything I got!>
<Wait, I need some more time for preperation.>
I thought of something where the portals are nearby the stairs and the demons rush from a distinct direction towards the moonstone unless something hostile (in this case: the player) is nearby. That would result in something similar to the AI of the escort-quest, but with inverse factions.

If the map is designed accordingly with bottlenecks and different LoS situations, many different classes/builds would be able to adjust a tactic according to their needs to defend the valley against the demons. However, this might require more demons to spawn, but since the situation itself is better controlable by the player it should work and give the event more tactical depth.
Maybe I'll manage to edit a proposal of a maplayout that may fit this idea. If I do so, I'll post it later.
Cheers,
Patryn