Mellie, you should be able to see weapon damage in the stats. it will be something like Lightning Longsword - 0 100 0 0 0, Longsword + 5 - 100 0 0 0 0 Where the first number is the damage that tends to scale off your stats, then lightning, fire, divine and special or something. Just look for big numbers
Also they appear to be a lot further away then they actually are. If you are dying to the first one, you can always run to your souls as soon as you land as it will always spawn in the same location I believe. My strategy is about shrugging off/dodging normal attacks by circling and rolling or backing away to avoid magic attacks. Flasking when needed. Honestly Beatrice makes the fight harder. She doesn't do much damage and due to health scaling makes the kings harder to kill.
I think this fight is the only real gear check in the game. The rest of the bosses can be beaten by playing smart and learning the patterns. This fight doesn't let you take your time because if you don't kill them fast enough you could be fighting 4 at once.
The more complex the programs of an organism, the greater is the danger of insanity. It is very, very hard to be a god.