They then started looking around the manor - opening doors, looking through chests and bookshelves, reading the scrolls that explained the religous beliefs, using Comprehend Langauges and Object Reading rituals, etc. The most interesting thing here was their response to one particular room. As per the module, I described it as containing a mirror containing the reflection of a woman in great distress - but there was no woman in the room. They worked out that she had been trapped in there by magic, and decided to rescue her. Based on some past experience with trapping mirrors (in Thunderspire Labyrinth) they decided to teleport her out using the wizard level 7 encounter power Twist of Space - which worked. This was not something that the module had contemplated, and in the course of a pretty easy social skill challenge they were able to get a lot of the backstory of the manor from her
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They found evidence of necromantic magic (the aformentioned ogre skull, with large rubies in its eye sockets, and some old scrolls from Bael Turath). When the player of the paladin had his PC look closely again at the scroll describing the cultic burial practices and made a good perception roll, I decided that he noticed a stiffness/crustiness in the paper. Eventually, after use of Object Reading, the PCs worked out this was evidence of invisible ink. The drow then suggested that they should try and render the ink visible in the library outside the laboratory they were in, which would be more comfortable (good Bluff check). Then, lingering (good Stealth check) he pried the gems out of the skull eyesockets (good Thievery check). As per the module, this released the undead spiders inside the skull.
The combat which then ensued with these spiders was quite interesting, although they themselves were only a single level 7 soldier - the drow trying to conceal what he'd done by making Arcana checks to keep his magic quite and using Bedevilling Burst to push the spiders back into the skull. Unfortunately he rolled a 1 on his attack, and being a chaos sorcerer therefore pushed everything over, sending skull and spiders tumbling into the adjacent library. On his next turn he used Thievery to surreptitiously pocket the gems in the middle of combat, while the wizard and defenders tried to kill the spiders without wrecking the library that they were fighting in. This is my first 4e combat in which the
"Rule of the Ming Vase" has come into play.
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I found that 4e can do some stuff I hadn't fully expected, like creative use of spellcasting (in freeing the trapped apprentice) and - because of DMG page 42 - handling the Ming Vase situation much better than some other games would (better than Rolemaster or Runequest, in my view, and probably better than 3E as well, although I'm drawing on less experience in making that call).