Hello! I'm running a group through Mummy's Mask, and they've just discovered Chisisek's Tomb. We've been using milestone leveling, and I've been debating when I should level them up next. They are currently level 9. The guide for milestone leveling just says "they should reach level 10 by the end of the book".
I guess I just don't really know when would be appropriate. Part of me wants it to be after the Seps battle, but idk how challenging that fight will be for this party. Then part of me wants to make them wait until after they face Jamirah, but I also don't want that fight to seem too challenging (Jamirah's statblock is pretty crazy, so a level bump might help). But I also don't want it to be underwhelming. They also tend to be kind of completionists, so we spent a lot of time in the dessert, hitting most encounters except for the Roc's nest, so part of me wants to do it sooner to represent how much they uncovered on the way to the tomb.
They will probably have Tetisurah with them, because they are all high-charisma and all good-good boys.
Party comp wise, no one's really that "optimized", but they are competently built and smart players. We have a swashbuckler, a casting/buffing shaman, a paladin (who is the least optimized and kind of under-equipped), and a melee oracle (who focuses more on tanking than damage).