So I have done Vault of Glass lots of times and Crota's end a few times. I've done both enough that I feel I need to write out some tips/problems I often come across when I hook up with random people (which can suck at times).
Vault of Glass:
1. Use your best gear (weapons and armor), preferably at least one or two weapons with void damage to help out with minotaurs. Get weapons to at least 300 damage at least, no matter if its hard or normal.
2. Communicate as best and as much as you can, and use team work, try to stick together as well which leads me to my next point....
3. Don't be a dick/douchebag! (also don't suck) This applies to both raids but if you go off and do your own thing, or keep getting killed its only going to annoy/frustrate everyone else.
4. On hard mode play safe, especially during the conflux part in the beginning, unless your a warlock with self res you should be killing enemies as fast as you can and taking cover, in the beginning with one conflux you can stay close to the conflux and not roam around, that will generally get you killed.
5. If you haven't done this raid or other one read up on it beforehand and ask for advice if your unsure.
6. The hunter can usually get through the jumping puzzle and gorgon's maze part if he has all the invisibility perks on as well as his agility as high as he can have it.
7. When doing the gorgon's maze and jumping puzzle, switch to your highest agility perks and any weapons that have agility perks equip them.
8. For the jumping puzzle and gorgon's maze, hunters go blade dancer (switch to gunslinger at jumping puzzle if you can't blade dance across or don't know how, with triple jump), titans go striker (can use special to get across easily) and warlocks go sunsinger (you can self res even if you don't make it or fall off).
9. In between conflux phases and oracle phases, you can hide in the spirit bloom room or the big pillar next to it.
10. When you get to oracles, call them out so they can be taken out quickly and easily.
11. For templar have at least 1-2 people go in each portal, and you can do both portals at same time, if someone has gjallahorn that person should go in the portal.
12. Once you have the relics and if your not defending the portal go to the middle as soon as you can.
13. For atheon, when you go to venus, right make sure the two without the relics help take out the minotaur with grenades.
14. If you don't know how to use the relic, better to let someone that does know and someone with a higher level as well.
15. Best/fastest way to take down atheon is go to the middle platform, turn on relic shield in front half and have titan with weapons of light bubble in the back (titan's should be defender during atheon it helps a lot)
16. When time's vengeance gets down to about 5 seconds start jumping out but relic holder should still hold up shield until it gets to zero.
thats about all i can think of for Vault of glass tips... many of which apply to crota's end as well.
Crota's End:
1. For the first lamp part/maze hunters should go blade dancer and everyone put on the perks that give them the most agility.
2. Don't be a dick/douche bag and try to solo it, stick together as a group, otherwise you will burn out all the lamps, people will start dying, you may have to reset the first whole part, some or most of the group will have a lot of weight of darkness on them and will be super slow. I had someone do this the last time i did the raid, he blazed through all the check points and burned out all the lamps (he was a hunter).
3. The first chest is random and can be gotten solo, look up videos on how to get to it, but its in one of the doors in the first part of the raid.
4. The second one can be tricky to get and still don't fully understand how to get it since I haven't done it as much, but you take out both shriekers as fast as you can, and have someone that is blade dancer with the most agility they can have run ahead and try to get through the door. Everyone else stay back and die/reset if someone doesn't get to the door, don't rush ahead.
5. For the deathsinger part (you can and should just skip it since you don't get any rewards from it), take out the knights, then wizards then shriekers then the deathsinger, and you have to do it as fast as possible too.
6. For Crota, wipe out all enemies on both side of crystal and go too room directly beneath it, it will offer a lot of cover from crota and the ogres.
7. You want to take down crota's shield when he is in middle, and use sniper rifles/rocket launchers, and constantly be hitting him or the shield will regen.
8. the person carrying sword should be a titan or hunter with their agility up as much as you can, also the person with the sword should have the chalice of light as well.
9. You can also cheese the whole thing which is pretty easy to do as well.
10. Like in vault of glass, use your best gear, use raid gear/weapons (as they have perks that relate to hive or the raid).
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best raid tip every -blam!-ing listen to the people that have more experience than you at the raid and don't be off in your own little world had to many newbies do there own thing or off in the most random places thinking there helping.