[X] Plan Talking Shop
-[X] Move this talk to a more private setting and by private you mean warded to the point that dust motes can't enter without permission. Add your own magic on top of whatever Psionics are used for said warding.
-[X] Introduce yourself properly and ask the Illithid to do the same. Point out that they can tell this is a friendly visit by how you politely made an appointment instead of burning the house down to the bedrock.
-[X] Explain to them what you found on the Shield Isles and the Iron Isles and that you are here to see if there is some mutual enlightened self-interest possible between your groups.