Own ROI and completed all the missions / strikes etc but never did the WotM raid before taking a break.
Feels good to be back and currently got my warlock to L388. Apart from IB this week what else is good for getting upto L400
Also noticed people using the Vex Mythoclast and other older weapons. have these been bought forward to the higher light level?
To get to 400...
Three of Coins
Heroic Strikes
Skeleton Keys/Strike Hoard Chests
Nightfall
390 LL Raids
Archon's Forge
Crucible End-of-Match Rewards
Faction Rank-up Packages
...and yes, old Raid weapons have been brought up to light level. Each primary features an "Adept" Exotic version which has an elemental property and a Legendary version which does not feature an elemental. Each of the four Raids has a 390 LL version now with each one being featured as a weekly with Challenge Modes which reward you with the Adept primaries.
As far as getting to 400 LL, I took my lone PS4 character from 315 LL last Thursday night to 400 LL yesterday without using 3oC or Exotics. I did it mostly with Heroic Strikes, Skeleton Keys, Archon's Forge, Faction Rewards, and Iron Banner. Also during that same time I completely unlocked and completed the Gunslinger and Nightstalker subclasses. This process is really easy and a lot less grindy now.
Edit: Also, don't forget to pick up the Weekly Vanguard/Crucible bounties from Zavala and Shaxx respectively as that's another good LL increase option. In any case there many avenues in getting a character to 400 LL and it's rather painless if you enjoy the gameplay/gunplay.