You can really make Ranzatsu do what he wants, I'll just go with what you decide. Though, I don't think trying to tame the golem is a good idea for two main reasons. The first reason being that, due to its being both rare and powerful, it probably won't work at your level (or mine), and the second reason being that, at the levels we are, if we actually were able to tame it then we would become overpowered. Plus I'd assume it'd drop some pretty good items, so if we can then I suggest killing it.