Robroten got nerfed. Havenīt been able to find a new spot, but will try it further. I will leave a message if I got news.
The Chiefboss is still doable. But it is a little bit tricky to get him and yourself in the right position. In the beginning he will attack you, but his attacks are a bit slower if youre on the safe spot. You must find the right position on the Safespot (Rock in my posting above) then he will not attack you. It really works, it is just a bit more tricky now. Especially getting to the rock needs al lot of jumping. I suggest using the right side of the rock when you have pulled the chief and are running back to the rock. Just use the textures of sand as way to jump up.
The Random Boss Telko ( I think he is random ) works the same way too. Mostly he will not chase you to the rock, but if you are on the way to the rock, he will stop chasing you and not attack you as well but you can do. So still works but is a bit trickier than before.
To non-Caster-Classes, get a bow, throwing-weapon, crossbow...should work but will last longer.
If someone canīt get it to work by no means (right english expression?), leave a message and I will post some screens.