You have a Skill that can counter his Meteor, or you can also bait him into wasting his TP bar.If you want more details you can ask.
What is Meteor Counter Skill? Meteor damage was reduced using the void skill. It's too difficult.
Oh you mean the battle in general? Well it is meant to be difficult since is the strongest boss in thsi version (0.7). All Ican suggest is to collect everything you can to get stronger. There is no plans on making him weaker at the moment.
