The amount of creatures in your army is limited. All your creatures over the limit disapear at 00:00 UTC/GMT +3
At the start of the game you have 50 army slots. You can increase its amount by:
- Ranking up (+5 army slots as a rank reward)
- Buying additional slots for gems). +5 slots for 59 gems or +25 for 249 gems. Friday discount (starts at 11:00 UTC/GMT +3) allows you to buy slots at a lower price: +5 slots for 29 gems or +25 for 129 gems.
You can increase your army slots if its total amount under 1400. Then the only way of increasing it is by ranking up.
Here is a little hint:
- If you are planning to donate to increase army slots - do not postpone.
- If the total amount of your army is ~1375-1390, then buy 5 slots till you get 1395 and after buy 25, so you can have 1420 slots.