TW Rules and guide lines for looking over first

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Raid Leader (RL) - the RL is in charge of the raid. This person says when we start, when we stop, when we are ready for pulls, when we break for quick AFK and makes any other decisions as necessary. This person will usually form the raid groups and move people as needed during the raid. This person will also communicate any specific strategies on particular mobs.

Main Tank (MT)
The MT is the person we want the mob to stay focused on for the entirety of its short (we hope) life. This person usually has the best combination of gear, mitigation, resists, spells, combat arts, avoidance, hate generation, self buffs and group buffs for that particular encounter to allow them to survive and stay at the top of the mob hate list. Usually the MT is the same for an entire raid. However, some encounters may necessitate a different MT. Any switch will be announced by the RL and groups adjusted as needed.

Main Assist (MA)
The MA is the person who designates which mob in a multi-mob encounter is to be killed next. Every person on the raid should make sure to have a hotkey set up for assist. The MA will target a mob at the beginning of an encounter, hit your assist hotkey and begin attacking when called for. Sometimes the MA will shift mobs mid-fight in which case they may call for assist again and everyone on the raid presses their hotkey again. One of the quickest ways to die on a raid is to be attacking a mob that the MT is not actively attacking and taunting. Don't let this happen to you. Do not simply target the MA and attack anything they are targeting. There will be times the MA is trying to get a target and will briefly have a non-engaged mob as target. Sometimes this cannot be avoided because of walls, LoS issues, mob positioning etc. If you are targeting the MA during this time and attack, you may very well aggro a new encounter, wiping the raid.
The MA needs to know for every multi-mob encounter the order in which the mobs should be killed. I suggest the RL or MA has notes for specific encounters listing the order to kill, from most dangerous to least dangerous.
When a mob is getting close to death, the MA is looking for and finding the next mob to be killed based on the order decided as above. As the current target gets to within a few seconds of dying, the MA SWITCHES to the new target but does not issue an ASSIST message to channels until the current mob dies. So, you may be asking, what is the bid deal here? When we are in an encounter and a mob dies, do the remaining mobs stop, waiting to see which one of them are going to get hit next? No, they continue their DPS uninterrupted in their focused effort to kill us. What we want to do is to have the same uninterrupted DPS on them. When a mob gets close to death I personally hover near my assist key. The instant I see the death message I am hitting that key and hopefully am fighting the next mob with few if any missed hit opportunities.

Off Tank

In some cases an Off Tank may be used. This will be someone who can not only deal with an add in an emergency but will not die in a few hits. This person will normally be used when the MA is busy doing other duties but will not normally do the mob start to finish. Most of the time the raid can ignore the Off Tanks as they will be dealing with the mob solo and communicating with RL or MA.

General Info
Sure we use stuns, specials and AOE Hits on raids as needed, but at the end of the day, our DPS is what kills the mobs. The smoother the transition between targets, the more sustained DPS we are generating.

Be at the raid start location on time. Understand your class. Understand your abilities and what they do, as well as what problems they can cause. The greatest nuke in the world is not much good if you get to cast it once during a fight, then immediately die to aggro, get rezzed and have insufficient power to cast it again.
Better to maybe wait a bit and be able to cast it multiple times during the fight. Understand what debuffs you have that are better than any other class debuffs. Where you have similar to others, talk with them and make sure that one person is debuffing but that you all aren't wasting time by overwriting each other. Understand what single target, encounter target, and area target spells you have. When the RL calls for single target ONLY damage, make sure you are ready to use only those spells. And always /assist MA.

Great guide Clawz, i agree with all wrote here