1.Combination of all the above 3 options would be preferable.

2.Sadly the Chinese already got a Salamander however this is my roster for Slavic myth units- Vampire, Werewolf, Ghoul, Gargoyle, Kikimora, Leshy, Alkonost, Zmey Gorynich, Simargl, Domovoi, Samodiva, Vodyanoi, and lastly Drekavac is the Slavic titan unit.

3.Don't have an idea about watercraft and siege but I have decided the human units.

4.Major deities should be Perun, Belobog and Chernobog (Veles would be a minor god).

5.Architecture should resemble this: 1 and this (please ignore the stonehenge): 2

6.I prefer the villager units looking like here: 3 and the heroes with this design: 4

7.The economy should be villagers that gather food in farms and construct buildings, archers that kill animals then harvest meat from them, infantry that chops down trees and gathers wood, cavalry that can turn inot either archers or infantry when killed (think the unique Bulgarian unit from AOE2) and special units that can gather the stone/metal resource.

8.Granted this is just my idea however the Slavic favor would be gained in the opposite way of the Norse and Egyptians, by gathering the other 4 resources- if even 1 single unit gathers 1 type of resource (mind you this doesn't stack/speed up if you place multiple units on the same resource) then your favour slowly trickles with 0.5% per second, however this can be increased X4 (meaning 2% favor per second) if you assign at least 1 unit on all 4 other resources.

9.The Slavs buildings and the units health/armor should be slightly better than the Norse but worse than the Greeks making them sorta ''jack of all stats'' type civilization overall.

10.Lastly, designing the wonders for the 3 major gods would be very difficult.