It seems most people are familiar with how to handle Tiamat. I've run 7 so far but not done it yet. Came close but no cigar. Found this guide that's from the PC version but should work as well on the Xbox One.
http://www.ddmsrealm.com/neverwinter-rpg-guides/defeating-tiamat-player-guide-walkthrough/
It's only been just short of a day since release. I'm sure people will get th hang of it soon. It's not going anywhere so there's no rush.
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I've swapped some powers around so I've got some good knockback for when defending the clerics. The only issue I've found is that not enough people defend the central cleric.
Not sure if it's different on Xbox to PC but the heads seem to respawn with 25% health so it's not worth getting them down much further than this.
If you get them down to like 10% they should respawn with 10%, but if you get them down any lower than that, they respawn with 25%. It's all about finding just the right time to stop. Sometimes on PC people still mess it up.
Any of my comments not posted in orange are based on my own personal opinion and not official.
Any messages written in orange are official moderation messages. Signature images are now fixed!
Bottom line. Averages. You have six minutes roughly to bring down 2.5 dragon heads to 15%ish in the first round - 85%, 85%, 42%. You have six minutes roughly to bring down 2.5 dragon heads to 15%ish in the second round - 42%, 85%, 85%. You have six minutes roughly to bring down 5 heads to 0% in the third round, 15%*5.
If that average isn't kept (say 10 minutes to get first npc clerics going) a lot of players are going to stop trying.
Your gear score doesn't matter. But if you can't aggro, don't use gems and don't do DPS, you aren't any help, go boost your stats or respec or watch some videos. And dear lord please stop spamming nonsense in zone chat!