[1] The Lower Road

Since I had to, unfortunately, pause for a bit, Things have kind of stalled, so I'm going to kick us ahead just a bit. If there's anything you would have liked to do in the space between the last post and this one, go ahead and assume you were able to do it as long as it doesn't involve leaving the tunnels. If you want the kobolds to have done anything for you, they tried. Roll a straight d20 and on a 6+ what they did for you worked out. Five or lower it didn't.

While Alacandra can probably do the arranging herself, she will not be able to keep track of all the runes at once, and if the wrong arrangement is made, the elemental will either be freed or - if it's screwed up too badly - it could quite possibly explode. Successfully finishing will require three things. The first two are:
-- Manually adjusting the runestones set into the floor. This is a job of strength or agility, dc 12.
-- Reading the secondary runes correctly to prevent the spell from going wrong. This is either intelligence or wisdom, dc 15
We need four successes on those before we get three failures. Feel free to narrate your results however you wish.

Once those are done, someone will have to help channel the spell to be cast. That will probably be either intelligence or charisma, dc 15, but I might take arguments for other abilities.

Alacandra will be reading the main runes to make sure they're in the right place, but that means her attention won't be anywhere else, so you're relatively on your own for this!