So I have an idea for season 3… saving another kingdom and for the special event similar to the Atlantis Summon Weekend have them send a special traveling trader that sells things for season 3 special currency like:
Extra Carpenters: shorten building time on your base by x% for x number of days
Extra Miners: increase iron mine production by x% for x number of days
Extra Farmers: increase food production by x% for x number of days
Extra Scholars: increase research speed by x% for x number of days
Lucky Tokens: Double chance to get 5* heroes (no more than 3)
Rare and Epic Ascension items (5 or so randomized offerings limited number available)
Rare and epic crafting materials (randomized limited number)
The extra carpenters miners scholars farmers are like visiting citizens hired as additional labor
The other items are things the trader has “found” on his travels and brought to offer for trade