Talk to Raibaht (A), who wants you to collect 3 key items in order to repair the barriers. These can be found in boxes scattered about the encampment (including behind the maw!). Return to him for completion.
The engineer overseeing martello maintenance has tasked you with replenishing the energy store of one of these curious magical structures. Acquire a supply of fuel, deposit it in the camp's martello, and report back when the operation is complete.