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Fisshy's Guide For Assisting In Instances and Being Useful
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1) Who to assist, which mob to target? First of all, why is this important you might say, afterall you STILL can complete the instances that you go into. I want to let you know what your group of 5 can simply play and simply attacking any target and pulling and YOU STILL can make it up to level 60 and complete instances up to Sunken Temple and parts of BRD (mid level 50 instances) without much trouble (occasional wipes are there of course)
When u try to use the same tactics in Strat/Scholo/BRS/DM (ogre especially) i can guarantee you that you WILL have multiple wipes near to the instance entrance and u will be left wondering what went wrong. Pulling 6/7 mobs with three 61/62 elites is no joke.
Learn to make and ASSIST MACRO and learn how your teamates play. Make a new macro with an icon and type in /assist KillaKat if Killakat is designated to be the main assist. When u click on the assist icon, you will automatically target on the mob that Killakat is attacking. In this way, all will be attacking the same target. Make a macro for sheeping and pulling as well. I cant remember it on top of my head now, but i have those. These are important as you let your teammates know what things are going to get sheep/sapped or when/what are you pulling.
Always let the TANK pull/charge. (there will be some rare instances where a sheep/shakle pull is needed, but u will be informed before hand) When the tank is not confident of pulling in fear or aggroing nearby mobs. Let the hunter (if there is) pull cause his range is longer and if the pull goes bad he can always feign death (it does fail sometimes

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Why is it important to let the tank pull? Its not so important at lower levels but as u go into harder instances any leather/cloth wearers will get killed in a shot or 2 by hard hitting mobs. I am NOT joking. 2 hits from a mob with a crit somewhere inbetween and you will be DEAD, u wont have time to go into shadowform/vanish/blink/run. U WILL DIE and drop down fast and dont know what hit you. One example out of MC/Onyxia are the ogres/captains/guards in DM north. During their enrage mode, the can even crit for up to 2k or more per hit
Before starting the instance, take time to discuss who will be tanking/assisting and their style of play and it will make your run wipe free and stress free.
2) Rogues, always feint when u have the chance. Hot key it, and when it is lighted, feint before and after u attemp a cold blood eviscerate. I confess that i NEVER use feint untill i was like level 55. Start early and get your basics right so you wont have trouble in the end game. Try not to grab aggro fron the tank by using your most UBER damaging spell/skill early on. Mages/Hunters/Rogues are the number 1 public enemy of tanks cause they keep overnuking. A rogue's MAIN GOAL in an instance in NOT TO GET HIT by anything and therefore dont need a healer to heal you. Yes u r a DPS class. Any tom d*** and harry playing a rogue can ALL do insane amount of damage but only a handful, skilled ones can avoid aggro and avoid getting hit.
3) Mages, u need to control ur hormones, especially fire mages. Pyroblast/Fireball/Conbusion/ Arcane power/Fireblast/Flamestrike/Blizzard are NOT to be used in the beginning of the instance fight. Use it towards the middle/end to finish up mobs. If you use early in the begining mobs will be all over you. For fire mages, scorch is your best friend. If u have clear casting, keep scorching and then AM/Blizzard during clearcast. In the middle of the fight and toawards the end, feel free to dish out ur damage spells. THe AIM of a mage in an instance is to help with crowd control by sheeping (AND ALSO RE-SHEEPING), and its almost the same as rogues, IF you are playing well, the mobs will not get to you and be infront of you hitting you, unless its a rare occasion.
How do i (and im sure experience players will agree with me) tell the difference between a good rogue or mage (or priest or hunter or shaman or druid or warlock). If mobs keep surrounding you and hitting you, you are the same like 80% of other people playing your class; which is u SUX at your class - plain simple. Good and excellent players will know how to balance between DPS and aggro and your main aim is to strike a balanace between those 2.
3) Another thing are debuff slots that mobs cast on you and you party members. Mages/shamans/ druids please keep an eye on curse/poisons/disease, remove them as soon as you see them. It gets very nasty during end game and early on, do train your eye to look out for them.
The key to why i am stressing all these is for new players to have their basic right early in the beginning of the game and in the endgame i can guarentee that you will thank me for it. The faster and earlier you get your basics right, the easier it will become and you wont have trouble during end game. I wished that early on when i was playing, there was someone that told me all these things. Learn early, and apply it early - FTW!!!!!