Illuvials may have a separate omega move. It would add to the variety of illuvials. 150 now becomes 300 or 450 if an illuvial has the potential to have a different move. For example the rampfire has a firebomb type move now but then you can catch one with a fire breath attack or dragonclaw move. It would add to the mystery of which ramp fire you would face and which one you may capture. Similar to Pokémon with different attacks. this would also allow more creative animations for each illuvial which are the most fun to see instead of the same omega animation
#Multiple omega moves
dry sundial
This may aid the transition to MOBA as each character would have this set base of special attacks in addition to items and the base attack. So the illuvial will have the three omegas to press to launch the attack with the typical progressions to level up these attacks. add to items to use and level up like the armor that reflects damage for 5 seconds when used or invisibility cloak. I can see Archie using that then appear with his root move to initiate
brittle flicker
I like this idea, a lot. it adds a bit more interaction to the auto-battle (which is what auto-battle critics dislike), it adds an element of timing and could be switched from auto to manual at the players discretion on a per-illuvial basis. The additional Omega attacks could be NFTs too that are specific Items for a particular Illuvial.
woven folio
I think if the illuvials get reskinned for future sets an alternative omega would apply. Eg set 2 has an illuvial that uses the same model as ramphyre but is a magma rouge fighter with a pterodactyl-claw attack omega.