Abilities:
Concussion Bomb: Hits for about 2-3k and stuns the character as well as throwing them in whatever direction from it's epicenter you are. Solution: Avoid.
Land Mine: Don't know actual name but hits for 3-4k, graphic is much redder than other bombs. Solution: Avoid.
---Notice--- If you absolutely must get hit by a bomb (trapped between 3 with no time to move; yes, it happens) the land mine is safer if you have suitable HP to soak it. Never choose the concussion bomb unless you are low on HP.
---Notice--- Both the above bombs' blast radius is about a dwarf's length greater than the visual.
Light Bomb: Travels outwards from Johlen and explodes shortly after, blinding anyone looking at it within a 180 degree visual. Solution: Face completely away from it.
Wisps: Floating whirling balls of death. Look like yellow versions of the light bomb. Solution: Don't get anywhere near these. Their damage radius is about 3x bigger than they are, and they do 5-6k damage on "impact".
Devastating Bomb: Johlen drops this at 75%, 50%, and 25%. It WILL cause a wipe, even though it only does 90% of all character's max remaining health. Solution: STOP DPS at 53% and 28%, wait for light bombs, then DPS Johlen as soon as they fade to drop the bomb, then EVERYBODY dps the bomb as hard as possible.
Visual Guide:
Blue Triangles: Healers
Brown Lightning Bolts: Tank and DPS
Red Star: Boss
Yellow Spraypaint: Wisps
Purple Stars: Light Bombs
Black Arrows: Where you should turn or run to avoid light bombs
Phase 1:
Ranged DPS spread out to "soak" bomb placements, but remember to move when one is placed on you!
Melee and Tank try to keep boss near middle for transition phases.
Healers keep near trees, although you have some leeway to roam.
http://i45.photobucket.com/albums/f66/vaserati/Johlen1.png
Phase 2 & 3:
Ranged DPS spread out to "soak" bomb placements, but remember to move when one is placed on you!
Melee and Tank try to keep boss near middle for transition phases.
Healers keep near trees, although you have some leeway to roam.
Face away from light bombs! Healers stare at your designated tree!
http://i45.photobucket.com/albums/f66/vaserati/Johlen2.png
Phase 4:
Melee and ranged stack on tank. Alternatively some guilds choose to put the ranged with the healers, although this puts the healers in more danger. Follow the tank at all costs, unless you know it will lead to your death!
Healers HUG trees. If a bomb is placed on you try to make yourself parallel to the tree and the bomb epicenter so you won't be thrown into the wisps.
Remember to watch out for light bombs. The wisps will dissipate during light bomb phases, but make sure to collapse back on tank as soon as they fade!
http://i45.photobucket.com/albums/f66/vaserati/Johlen3.png
Blow all CDs and nuke boss!