Judging by the test server there currently no indication that we will be able to buy any of the event buildings with gems, but then again they have in the past forgotten to put buildings into the shop until the players pointed out the omission.
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So I decided to do an experiment being fully aware that this is not working as intended and found that
1) generals that are booked with jog did not receive the bonus, generals with no books in jog all got the bonus (I do not have any generals booked with navigation crash course)
2) the fast generals all ended up in a cycle of not being able to land - as expected from the posts above
at this point I cancelled the adventure
the fast generals returned home and built their garrisons
I then cancelled the adventure - started the one I really wanted to do and went to send my now normal travel speed generals across - at this point they all disappeared and were back travelling home from adventure number 1.
At least the building looks nice - but rather expensive for a decoration - please can we get this fixed
We're definitely working on fixing the Observatory.
And the games keeps freezing when the zone effect is in place
I seem to be managing to get resources speedily to an adventure provided I send only one quartermaster at a time. More than one, they just loop through unloading & reloading themselves until I have to send them home with all their troops.