Darksiders 2 - unfairness

This post was going be about something else but I guess? I've forgotten that or am too lazy to even remember what I was going to write so I'm going to post about something else. I wanted to mention how I hate it that some bosses in Darksiders 2 come right after the other. It has happened twice or more since I've been playing. So it happened with this "Champion" called Gnashor :( We have to find three stones first that require visiting some areas, platforming & doing kiddy puzzles. I wish if a sub boss had to come, it was during first & second visits for the stones that wake the Champion but no. I had all my health too, most of the time. So all the pots, graves etc I broke, I couldn't take more health & wrath potions because I never or rarely used any. But during the last stone stage the game throws this beetle towards us, that is a sub-boss. I had to use most of my potions on this fight :(. It sucks that you can't carry more than 5 of each potion & there hasn't been any way to upgrade your carry size. So when I put all the stones on the skull or come out to do that, I can't even back track to get the potions lying around for me. This makes the fight very hard. In his first form it's easy to bring him down but in his second form, though I bring his health down quickly & keep dodging but he keeps regenerating & I feel I get very little time to grab his face when he roars. And I have only a few potions left thanks to that crappy sub-boss, no backtracking & the game throwing bosses at you one after the other. The crows do help but I'm low on wrath potion too, so I have to wait for it to get full. This isn't a very difficult fight IMO but these things fuck the whole fun of a game. The story is a drag too. They've made him an errand boy. He's Death for fuck's sake. He should be taller than other heavy looking giant characters too but instead he looks like a dwarf when he's talking to other characters & at times he seems too polite.