Here’s the secret to Doom Slayer: turn a scroll of transmutation or 2 into a pack of recycles. Now use these recycles to make a bunch of scrolls of rage and then turn them into stones of aggression.
Stones of aggression are super strong when Yog has a bunch of dangerous Demon Halls enemies around him. They beat him up really quickly. With a bunch of stones you can even afford to use some against the fists.
Other things you want: scrolls of psionic blast (exotic retribution) and potions of magical sight (exotic mind vision). Psionic blast can wipe out 2 fists and all the regular enemies when they build up too much. Just make sure the fists have moved off the platform first.
You’ll also want potions of stamina (exotic haste) to allow you to move quickly and stay far from enemies. Scrolls of dread (exotic terror) are also excellent as a panic button. Just make sure you run away from the enemies after they get hit by the dread so they can leave line of sight (which wipes them out as soon as they do).