Both Guild War (GW) and Clash of Worlds (CoW) are team efforts. For GW, only a select number of Guild Members ("Champions of the Guild") can participate: those who have been assigned a signet by the Guild Master or a General. Signets are generally assigned by the strengths of the member's Heroes and Titan teams but, to a lesser extent, also by participation. All members can (and should!) participate in CoW. Only those Guilds in the GW Silver and Gold leagues are eligible to participate CoW so it is important to maintain a good standing in GW.