How to fight EA Abysia?

[Il Magno]

The title is quite self explantory,

Any way: its a well developped game, the abysian has a very good gem income and a roboust kingdom - army

I play Sauromantia and I'm the second most advanced player in the game.

I am scared mostly by:
assassins
huge fire snake brigades combined with fire mages batteries

I can counter lot of androphag arcehers, skellyspam, witch-sorceress cavalery, huge amount of nether darts mages

ps I am not a very skilled player, so I would prefer simple suggestions if possible

thx guys