You may want to combine this with the quest Bona Fide Treasure Seeker, since it needs the same zone. (if you haven't already completed it).
Note: You have to first complete all the sub-quests in this line, up-to-and-including, Undoing Dedraka Damage, before you can getBona Fide Treasure Seeeker, so the above suggestion is a little confusing.
Teleports to adds. Chase him down, then tank and spank.Tip: clear all the adds leading up to this fight so the adds will not join.
note: if on Visions of Vetrovia: Evil Dedraka quest, click the corruption that spawns behind him after he is dead ( -293, 105, -614 ) Copy/waypoint -293, 105, -614.
Has increments. To increase damage to him, pull Scarfeather to the bubbles in front of a grazing ceredon. Note: need to approach the front of the ceredon or they may not knock him down.
Do not agro the blazing drake flies, they give him a buff (when you agro the flies they will fly to you and Krelburn). Krelburn will eat any flies near it to gain buffs. You will see a new icon appear on the first left row of buffs it has, and he will turn dark red and firey. There is an area to the right of bridge ( -472, 125, -313 ) Copy/waypoint -472, 125, -313 where there are fewer flies that will spawn. If Krelburn eats a fly, cast defensive or healing spells/Combat arts and wait for his buff to expire as his buff will reflect damage to you. (You can try to damage Krelburn when it has it's buff up but you need mitigation especially against Heat damage. This advice is for players with only starter gear as your DPS will be very low for this boss.)
Dance to stay out of the black spots which will spawn a plant which is a 1-shot. He will emote "sends out more of its seeking vines underground"
Joust when he emotes "Krelburn reaches..."
DO NOT kill Cannibrea as part of this quest. You need him 'up' for when you get to the Bona Fide Treasure Seeker side quest - it uses the same zone. If you kill Cannibrea now, you will have to reset the zone and start over.
Once Krelburn is dead, Click the vines behind him. Then go to the corruption source. Behind the stone, speak to Vaziri ( -644, 117, 115 ) Copy/waypoint -644, 117, 115.
(If you combined this with Bona Fide Treasure Seeker: You must kill the three epics before you can touch the stone. Then, touch the stone, then Vaziri will appear and you can talk to him for the update. Then, use the portal to zone out. Immediately zone back in to find Findink to update Bona Fine Treasure Seeker.)