Vita est Ludus

Asking the party (and probably amusing the DM):

So if the next session starts with, let's say, the party going to the dusk elves camp to find Kasimir and Petrina, and if they find the camp has been obliterated, Kasimir impaled on a random tree, and Petrina is nowhere to be found, what do they do then?

Should Kili carry a raise dead?  Does the party have 500 gps to buy diamonds with?
Should Kili carry a Speak with Dead?  Do the party already know Kasimir's answer?

Kili is carrying Detect Evil to "see" the invisible Strahd.  It might have been useful to cast that on Petrina before giving her nuclear missiles.....

Good idea. Speak with Dead is good to start with, and cheap. We can deal with raising separately (we have the cleric who offered 3 raises IIRC).