I've been planning to kill Dagannoth Rex on my ironman account. The problem is I can't actually get to the safespot to kill him. Everytime I go down the ladder Supreme is always right there. I've tried hopping on populated worlds and going down their hoping that someone else is killing them, but haven't seen anyone. Earlier I tried going in before my ironman with my main account to tank supreme and prime so I can get to the safespot, but as soon as I went down the ladder supreme changed targets to my ironman.

 

Anyone here who has been killing rex, how did you get past the other two DKs?

You could use your main to actually kill Supreme and Prime, so that your ironman can just run without fear

I tried going down there again, and there were some people there killing them, so I managed to get some kills. Only got 7 kills before food ran out, ate half of my lobsters before being able to start killing him (ate some on the way through the dungeon and ate more trying to find a world where DKs are being killed). Plus my magic is only 53, so I'm not killing him that quickly.

 

Whats the best way to heal? I've just been eating lobsters when health drops too low, and using regenerate between kills.

Get adren up on spinolyps, kill them all and regenerate between Rex kills.