I will throw a bunch player driven content ideas in the forum, here it goes:
Node Beasts
Beasts like Manticores and others could be acquired by nodes through trading or quests.
These beasts could stay in cages or in the
beast pens, they do not attack citizens from their own node, they attack everybody else. Could have beasts for attacking people, attacking structures, bashing gates, attacking beasts or attacking ships.
PvE guys could run dungeons and sites and imprison them, beasts are valuable and will be great group content hunting them and bringing to the node.
PvE guys can actually influence in wars by bringing such monstrosities to the node's arsenal for selling or donating them to the node.
Great for node wars.
Such beasts could be transported in caravans, just like in circus cages for trading between nodes or node sieges.
The caravan could be attacked, the beast escapes and disapear.
The beast pens could have a lof of beasts.
Mayors and players with the role Beastmaster may transport, release for attack or set free such beasts.

Once realeased on attack or defense, they will fight and kill anyone except for citizens from it's own node.
After 30 minutes they fly away and disapear, so the beast is a consumable.
Acquiring them is through PvE and in PvP we use them.