Okay, so I’m not sure if this goes here- but. Look at the Monsters.
Look at Goliath. Then, closely to Kraken- similar. Goliath and Wraith share no traits. But Kraken and Wraith do.
There are only Goliath minions- so, here’s my thought.
Goliaths are the first ‘stage’ of these lifeforms, to grow to the next takes a lot of energy and spare mass, hence the eating, evolving, building up armor. From there, it could become a Kraken- and then a Wraith, respectively. Makes some sense.
… or not, I need sleep.