spoilers:
as far as Halsin says, there are three paths to moonrise towers: one in the underdark, one over the mountainpass (near the goblin camp), and one near where the githyanki patrol is. When you rescue Halsin, he tells you that its smarter to go the underdark route. Minthara the drow leader tells you to meet up with someone at the mountain pass. However, I haven't yet found a questline that would tell me to take the third path. Maybe thats where you would find the githyanki creche, if you are doing Lae'zels quest?
