We had little problem but it was ficed. Are you sure your heroes disaooeared? I'm asking because our case was this: You summon hero but after some time number of them in H. of Heroes goes down to 0/xx heroes BUT when you check in your acropolis youu will see your heroes even if in HoH says that you have 0. so are you sure , did you check in your acropolis/city if you have those heroes?

Similar disscussion -> https://plarium.com/forum/en/sparta-war-of-empires/game-discussion/77252_academy-upgrade-and-heroes/

I cannot summon heroes and keep them as they disappear after 30 mins. This has been over a week now

Personally for me everything is ok, works normal got 43/70 Heroes https://prnt.sc/gxlh7e

If someone still have problem, please report it to our support team, they will check your city and they will fix it. one more time, it should be fixed for all but..who know.. 
https://plariumsupport.zendesk.com/hc/en-us/requests/new

I can't see my Heroes at all in either Sparta or Stormfall!?

Tony said:

I can't see my Heroes at all in either Sparta or Stormfall!?

Hello, Archon!

Marius said:

It should be 75 with fully upgraded Scrolls of Wisdom. 50 by default, 25 extra from the Academy: 1 extra Hero per 2 Scrolls.

really surprised you said 75??? haha

you're still not enough to be a CM. so I think, Of course you don't play the games sparta is right

Marius said:

It should be 75 with fully upgraded Scrolls of Wisdom. 50 by default, 25 extra from the Academy: 1 extra Hero per 2 Scrolls.

I can not find where the hero is 75.. but it is said only 70 hero is fully

zlatan said:

Marius said:

It should be 75 with fully upgraded Scrolls of Wisdom. 50 by default, 25 extra from the Academy: 1 extra Hero per 2 Scrolls.

I can not find where the hero is 75.. but it is said only 70 hero is fully

Bio je neki bug pa smo imali duplo više heroja tako da su neki imali čak i do 100 heroja ako me pamćenje dobro služi.

I must remark and say that it really looks like 70 is maximum, not 75, I might be wrong, anyway, like I said, there was the bug in past and one of my teammates had 250 heroes (for real), she still has 86 left of maximum 70 lol