So, I’m sure I’m not the only one who’s been confused by why the Triasta of Bronze is the way it is. It’s spikes seem like they’d be good for stabbing anything except for what’s directly in front of you. It, for some reason, is a bronze-arcanium alloy, rather than just pure arcanium (if random pirates are able to get their hands on enough arcanium to make rams, surely a king could get enough for a trident/spear). Even the developers seem to be aware of the fact that in-universe, it probably wouldn’t be a super good weapon (as evident by Neviro being able to stand after Calvus attacked him with it, and also by the fact that any time Calvus hits you with the Triasta of Bronze, it only does 50 damage, which is pretty low by Calvus’s standards).
So my theory for why the Triasta of Bronze is such a seemingly crappy weapon in-universe, is that it’s supposed to primarily be symbolic and ceremonial. That would explain why it seems to prioritize looks over function, and it especially would explain why it is made out of bronze as well as arcanium, as bronze is a very fitting metal to represent Ravenna with, considering how they seem to be the number 1 producer of bronze in the War Seas.
What are the implications of this you might be asking? Well I believe that Calvus probably has some less fancy-looking arcanium spear/trident somewhere in his Castle which he would use if Ravenna was going to war or if he was getting his hands dirty with something that he had planned for or anticipated. I believe that the reasons why he uses his crappy ceremonial spear against us, may be partially because he did not have sufficient warning about our escape in order to get his war-spear/trident, and partially because he was arrogant and didn’t think he’d need to use much power to kill us.