Excelsior

Can some help me with all the markable balron spots?

Google. There are probably very few people that are going to give them to you as that means one more person to compete with for kills

And forum search. The general areas are Terathan Keep (4 spots, 2 close together) and Hylothoth lvl3 (2 spots) The actual search for the spots you'll have to do alone. Please do not expect to be given everything - explore, learn.