In the clean up phase, do I store the unused Advanced Technology Token just like the Basic Technology tokens on the feature section? Or they're simply discarded like other resources?
Also on the production phase, in the 5 players game, do the Atlantean gain 5 defence tokens (total number of players), or the maximum is 4 what the board stated (2-4)?
Unused advanced tech tokens are discarded.
Atlanteans produce 1 defence token per player. While the expansion allows playing with 5 players, they don't recommend it, which is probably why the player mat only says 2-4.