I did a thing.
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You have just wrapped up story and arrived at Social Space. What to grind, why and when for Power Level?
I have used great write ups from JohnOfMars and Nami as help / base for this while added own info. Stuff isn't in particular order so make sure to read it all.
Aim for 270-280 PL before raid opens in order to be safe for NM Raid
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01. When in Social Space game has you talking with different NPC's for some dialogue and rewards. Talk to everyone else, but Zavala. DO NOT take that Exotic engram from his hands! Why? Its power level goes up as yours go up so longer you delay picking it from him into your inventory higher Power Level exotic you are going to get
* When your PL is high as possible, 260-270 is reasonable, return to Zavala and pick up your scaled up Exotic engram
02. Now head out to Patrols (EDZ is super popular atm) to do things. These things are...
* HM Public Events - Every event has specific trigger for HM, Datto made video on them. For e.g. Glimmer Drill event with Fallen has you destroying small machines near drill to trigger HM modifier
* Loot every possible chest that isn't nailed down for Glimmer, tokens and gear
* Return Tokens to Patrol vendor to level vendor up and get gear. Their engram levels up all the way to Power 265. Always good source for Gunsmith material as you can break this loot for parts
* Run and rerun Lost Sectors for loot as it scales with you by some degree
* Run and rerun Adventures for loot as these also scale
* Kill every high value target you come across as these also scale
03. You see blue markers (quest triggers) on the Director map. Avoid them as long as possible as they reward Legandary gear. Closer you are to e.g. 270 before taggling them higher Power Level rewards are
04. You will come by quests and quest items for Exotic equipment just like in Destiny 1. Just like with world quests avoid doing these as long as possible. Same as above, higher your Power Level is upon completing quest higher PL exotic will have
05. You can complete things like Patrol milestones, but do not turn them in before your PL is 260+ As you turn them in you get engram for your troubles and this engram scales up with your PL until you go and pick it up
06. Postpone doing Cayde-6's treasure map content as these rewards also scale to your PL so 260+ is recommended here also
07. There is no need to hold on to the engrams that you get during PL grind as just like during leveling they are rolled moment they drop and go into your inventory
08. Leveling up Gunsmith is good way to get PL boosts towards that 260-270 range. While visiting Gunsmith remember to dump your Glimmer into Random Gear Mods he sells. At PL280 you can turn those blues into legendaries with 3:1 ratio
09. When transforming blue mods to violet mods remember to have all possible blues in your inventory so Gunsmith offers all possible upgrades!
10. You could go and tackle content like Nightfall relatively early on (PL 240), but hold off here too because rewards scale to your Power Level. Higher your PL is when you complete these activities higher your rewards will be, from strike and afterwards from Zavala
11. Each week you get "Well Rested" buff that makes 3 levels of that week faster to get meaning 3 faster Bright Engrams for cosmetics. Every character gets this buff individually
12. Just like before you can gain small gearing advantages by leveling 2-3x same class as you can transfer armor along with weapons over to boost PL and hence boost all content rewards right out of the gate
13. Because of smart loot system your alts gain Power Level faster than your first character did making gearing up alts faster
14. Stock up on Legendary Shards for infusion and Xur so don't be shy about breaking down legendaries that are too low PL to progress you
15. Check every item you get because they can come with Legendary mod equipped. This means they have 5 higher Power Level than they otherwise would have, this makes them prime candidate to be infusion base. Especially early on
16. Don't be shy about using Exotics you don't want / see use for in near future as infusion fuel early on and pump up Power Level of your legendary gear. You can always reprint Exotics from your Vault with some Legendary Shards
17. Infusion works little different in D2 than it did in D1. You can only infuse e.g. Auto Rifle with another Auto Rifle or Warlock Helmet with Warlock Helmet. You can't use other weapon types or armors of other classes to PL boost this time around. Pre-order gun, Coldheart, can be infused with Auto Rifles
18. Every shader, mod and spawn animation thingy (last goes to ship as mod) is single use and will be consumed upon use. Be very selective and careful about what you apply to what! Only apply when you are 200% sure you are going to stick with said item or ship for long time!
19. Feel free to farm Strikes at any point of Power Level progression, but doing HM Public Events most likely is more time efficient way to pump up that PL
20. Be sure to do and return in all weekly content (Milestones, Flashpoints, Nightfall, Crucible stuff...) before next Tuesday so you get rewards for this week and then redo it all on Tuesday in preparation for raid on Wednesday!