[Toter Alter Mann]

Obviously, you did not know that Stonehand can stun monsters while int aoeing. I didn't believe this for a long time, until I tried it myself.

So for heaven's sake: Master Stonehand! (or bring it to lvl 19) I allows you to tank a lot more mobs since some will always be stunned. Also, having high int, Stonehand won't run out of time for your whole run - afterwards, simply recast it.

Secondly, I would master Prevention as an aoe assist, it's already useful on lower levels.

Most important: YES, you CAN aoe on your own, without an fs. Having the 105 V7 set, combined with enough sta, the right element on your suit and stonehand, you can grab a leecher and kill alone. Food will be enough to heal you, your buffs will last long enough and if it gets critical: Pill - prevention - pill. By that point, the mobs will be down. Prevention makes you immortal.

I myself prefer a perm rm partner on my level who supports me with healrain and deals damage with MH, but if you don't have one, it's no problem.
I can take 25+ kings (which are 8 lvls above me) without rm support. But I recommend this rather for higher lvls.

In my eyes, the BP is the fastest leveling class besides the Elementor, who can aoe with a full int build, but not alone.