WW builds cleared GR 150 numerous times. @wuckertt
You can easily speed farm GR 110+ with it. Even more so this season with the Ethereals.
Look like PoE ?
Here's the link : https://diablo2.io/resurrected/
Rise of the Necromacer isn't a game, but a DLC to Diablo 3.
If Diablo 3 runs on your PC, the DLC will work too.
Don't remember though, if i ever tried to run D3 on Windows XP.
Win XP is mindbogglingly outdated and a security risk.
You can kill Kulle anytime by accessing his waypoint, but in order to get the chest, there has to be an official quest out to kill Zoltun Kulle. This quest isn't up all the time. You might need to open several games and control the Act2 bounties, to see if the Kulle bounty is active.
Remember there are 4 possible boss bounties in Act II: Belial, Maghda, Kulle & Vidian.
Only one of those will be active in an open game.
@V0yder: Did you farm the gear you're talking about in Season 20 ?
Seasonal loot will automatically be transfered to non-season after the season ended.
If so, you'll find an envelope (mail) icon in the bottom left corner of your D3 screen (assuming you use PC).
Season end : still Jan 6 ?
But: S16 start Jan 18