When do i place the doom token on the anceint's one doom track, only when i place a gate or also when there is monster surge (when a location for the gate lareday contains a gate token a monster appear on every open gate) do i also place doom token if this is the case

thx !

Lighteens said:

As a general rule, you have to add a doom token to the doom track only when a new gate opens. In case of monster surges, no doom token is added (unless you're playing with the Black Goat of the Woods herald, but I don't think it's your case). Some Ancient Ones might trigger extra doom tokens when specific circumstances are satisfied, and some Mythos cards do cause two doom tokens to be added at once, and so on, but if you're playing just with the base game, yeah, new gate = doom token added, and that's it