Presumably, this game is one in which four players participate, each laying down a single eidolon at a time. Once all four players have set down one eidolon apiece, the values of those eidolons are compared, and the eidolon with the largest value takes that series. After this, a new series is laid down, commencing with the winner of the previous series.
In Orbs, it is desirable to "take" sets that either contain Orbs, or that do not contain any Orbs, depending on the particular variant of the game that is being played.
It may be comparable with the real-world games of Hearts and Spades.