Inferno Lash - About every 7-8 seconds Beruhast may cast Inferno Lash. This has a cast time of 1 second and must be interrupted. If it goes off it will deal 5k fire damage to everyone in the raid.
Beruhast prepares to unleash a leaping flame - He casts on one player and the flame leaps to nearby players and deals between 1-2k fire dmg per leap, as well as leaving a DOT on the players hit.
Beruhast points at ____ and says, "You will die alone." - Raid members should stack on this player to divide the damage from Meteor. Looks like the Alsbeth stack.
Beruhast says, "A pet from Maelforge should keep you warm." - Summoned Flame - There are 4 braziers around his platform, he will ocassionally cast Summoned Flame and spawns a fire add at one of these braziers. The add should be tanked away from Beruhast, if the add is on top of the boss the add will heal itself for 10% of it's HP every second. This add will give Beruhast a stacking fire damage buff (5% per stack) every X amount of seconds it is alive so it should be burned asap as the stacks do not drop off.
Flaming Vortex - At 75% he begins his soft enrage by placing 3 vortices on the ground. These deal ~1.7k fire dmg and slowly leap around the room. At 50% he will put down 6 of these,and finally 9 of them at 25% (covering the whole room. Don't stand in them, and be aware they grow once.
One way to handle this fight is to simply stack all the DPS so that, most times, you are already stacked for Meteor. Leaping Flame can be simply healed through. When this strategy becomes sticky is when the vortices start.