The raid bosses your guild rotates through and the world bosses every tier fights at once.

Raid bosses

Each boss is soft against a different element, so the rotation moves who in the guild hits hardest without changing how much has to be dealt. The Knight has no bad week - physical damage has no resistance anywhere in the game.

• The fight runs in phases, and each phase changes what the boss hits with - the element you warded against in phase one is not the one waiting in phase three.
• Boss levels. When a boss falls, the next boss of the rotation rises at once - same week, boss level II: x1.6 the health and hitting x1.25 harder, up to x1.5 from level III on. Level IV brings the week's boss back a second time. Every level that falls pays a share, and the highest level down decides the week's top rewards. Monday 0:00 UTC resets every guild to level I.
• Everyone who struck a level that falls (at least 15,000 damage on it) gets its share: gold and exp worth hours of hunting at their level, plus elixirs - more for a higher place in Contribution, up to x2 for places 1-3. When the week ends, places 1-4 in Contribution each get a war, ward or bulwark scroll (the type is random) of the rank of the highest level down - I for levels I-II, II for III-IV, III from V - and that level's red and gold gear chests go by place, best first: 6 rows from 2 red chests on level I to 3 gold and 1 red from level VI. Scrolls and chests need 10 players who hit the boss that week. A scroll is a personal buff for 3 days that plays in the Descent and at the raid: War Scroll I +10% damage to elites and bosses, Ward Scroll I +5% to every resist, Bulwark Scroll I -5% damage from elites and bosses. Scrolls come in ranks I-III - a higher boss level pays a higher rank (up to +20% / +10% / -10%). Scrolls cannot be traded.
• Attempts are rationed daily. A raid is a week of small commitments, not one long evening.
• The wall hits as hard as the elite of your own band, so a fresh guild member is not erased in the first seconds - but the pool is shared and counted in raw damage, so a stronger character still contributes more.

World bosses

• One element is this week's weak spot and two others are resisted, drawn anew every window - so who hits hardest changes from week to week.
• Charges are daily - one per character - and the boss stands for a week. Only charges count towards it; missing a day is not missing the boss.
• The Warden takes the boss's blows on screen while you charge - he is there for the show, and every number comes from your own attempt.

What they have in common

Neither boss is content you can be locked out of by a schedule. Both are pools of health that a week of daily attempts chips away at, and both pay in things you cannot buy: scrolls, chests and standing on a board that resets when the next one arrives.