some tips on how to make bosses easier if youre feeling theyre too hard:
play a ranged physical dps class. that way you can hang back to keep an eye on the arena and what the boss is doing without having to worry about needing to stand still long enough to complete an induction
on that note, inductions are considered finished before the bar is full. you can usually move right before it fills and still have it go off, but it takes some trial and error to figure out how close you can cut it
move your ui around. my own life was made immeasurably easier when i put the target right above my hotbar so i wouldnt have to pay attention to both the top and bottom of the screen at the same time, but try stuff out and see what works best for you
the best time to mitigate an attack is right before the boss finishes casting it. the second best time is as soon as the mit becomes available, every time it becomes available
use addle and feint. you almost never see these used in casual content and it's a waste because they really are extremely useful skills at any level
use arm's length and surecast. there are some knockbacks they dont work on but those are rare. if you know youre gonna get pushed, use these and you probably won't get pushed
take advantage of duty support. the npcs know the mechanics. watch them and let them teach you
particle effects cant hurt you (usually). with the exception of puddles that stay on the ground for a while or layered stacks like akh morn, as long as youre not standing on the marker when it disappears (or are if it's a stack), you're in the clear. feel free to move through the animation if necessary. more and more mechanics require you to do so to be in position for the next one in time
it's usually fine to let spread markers overlap. just, yknow, make sure another person isnt in yours (though its the responsibility of anyone without a spread to keep themselves out of harms way)
when in doubt, ask your party members. it's extremely rare to match with a group of randos and have everyone be a first-timer. most players are happy to help, and the ones that know the mechanics but are bad at explaining them will usually just stick a marker on themselves (usually a triangle) for you to follow
read your tool tips. boss fights are as much a test of how well you know your class as they are your ability to read and react to mechanics. unless youre playing a healer or paladin, youre going to use your entire kit, so make sure you know what everything does
on that note, freecure is a scam. once you get cure ii/benefic ii, you will never need cure or benefic again. keep them on your hotbar for when you get synced content if you wish, but otherwise you do not need them. do not use them
if you play multiple classes, try to keep skills that do the same/similar things at the same spot on your hotbar. this isn't always possible bc despite what some may claim, not all classes of the same type are actually identical, but it will save you a lot of headaches
entirely new and unique mechanics are rare to the point of being nigh nonexistent. everything is a remix of something else and practicing in lower level content can actually be a big help
look up guides. the internet is full of them in pretty much whatever form works best for you (though they can be of admittedly variable quality)
turn down party effects. theyre on one of the tabs under character configuration > controls. if you put them on minimum you can still see heals and such but you wont have your screen constantly full of explosions
turn on target health percentage. this one is under character configuration > ui. it lets you better see how close the boss is to going down
make summons smaller. we all love titan's ass but not when it's the only thing you can see. "/petsize all small" will make this problem go away
relax and have fun. panicking leads to mistakes, which can lead to worse mistakes. if you need to take a second to breathe, do so. your party members probably wont mind waiting a minute or two between pulls
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