Monster hunter wilds spoilers
Thinking about how there’s a possibility that Guardian Arkveld had Deviljho DNA in it.
It’d explain why it had this inherent, powerful desire to eat that other guardians lacked, to the point that it was able to teach itself how to with no outside influence and why when it did learn how to, it just couldn’t control itself.
And even if Guardian Arkveld lacked a digestive system like the other Guardians (which is unlikely because that food has to go somewhere and also unlike the other guardians it has/or grew reproductive organs), there’s a very real possibility that it would still suffer that same ravenous, environment destroying hunger that Deviljho possess.
There's also the fact that Guardian Arkvelds battle theme literally contains segments from Deviljho's own theme. This may just be hinting towards the thematic similarities between the two, but personally I think it could be read either way.
If this is true then... Holy fuck Wyveria really created the most aggressively violent and angry creature they could. Giving a monster Deviljho's aggression and ceaseless hunger with the ability to fly, tussle with every other apex predator in the area and with no way to satiate that hunger due to not physically being able to eat. They basically created a monster that's only goal is to kill everything it sees without need for rest or even stopping to eat.
Zoh Shia is their equal dragon weapon, but Arkveld strikes me as their attempt to create something that will kill as much stuff as quickly as possible.