The game’s Siege Tournament: bracket, matches, defences, meta and search.
From the game's own tournament screens. Guild names as the game shows them.
The Siege Tournament meta: every defence placed in the tournament's finished matches, on all servers together or one at a time, for a season or a single round. A monster's pick rate is how often it is in a defence, and its hold rate how often those defences held when attacked; the meta scatter sets one against the other, so the strong picks stand out from the merely popular ones.
The lists rank monsters, two-monster cores and full defences by use, by hold rate and by the attacks they drew, and the leaders by use. Min attacks keeps the rarely attacked out of the hold rates; By server sets the servers side by side, and round over round shows how the meta moves through the tournament.