HeroesLAND is another “online heroes” game.

Svyatogor and Alexander Nevsky
In early December, we celebrate two important dates: the day of remembrance of the bogatyr Svyatogor and the day of remembrance of the great prince Alexander Yaroslavich Nevsky. The first is loved for his inexhaustible strength and contradictory nature, and the second, among other things, for the fact that he did not lose a single battle.
Therefore, from this moment until Monday (December 11), firstly, in any successful hunt on the world map, Svyatogor Tokens may appear, and secondly, Portals to Lake Chud will open, where you can ask the Teutons "what is their strength?" and take Alexander Nevsky Tokens from them.
These tokens can then be exchanged in the Tavern for themed artifacts.

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I don't understand what monsters you are talking about in HeroesLAND, and what those letters are, I don't remember that you had to catch something, or am I talking about the wrong game?

The letters are monsters; you have to take them from the monsters.