Simple Strategy:Ranged and healers space out around this boss. You do not want to be in melee range or near another player. Periodically, the boss will throw a sword at someone. You need to move away from it immediately, as he charges the sword and hits for damage. Melee are exempt from this mechanic.He will periodically cast Tempest, which damages everyone in the group. Healers may wish to save their AoE healing spells for after Tempest.When the boss puts up Bulwark, two things will happen: One, adds will rush the party from the front. Tanks need to pick them up. Second, bombs will drop from the sky onto the grass around the boss. Healers and DPS should run around and pick up the bombs as they fall and throw them on the shielded boss. If a bomb doesn't have a cog, that means it was not picked up fast enough and is about to explode - get away. The boss will drop his shield and stop summoning adds after being hit with enough bombs. Finish off the adds using any remaining bombs -- it should one shot them. The tank may die if too many adds build up, so it is important to get the boss' shield down as quickly as possible.
Repeat until dead!