I agree with some of the suggestions, but i think they need some more detail
I think Lux should indeed get a medium decelerating counter and an attack nerf (1300 would probably be enough), but also a change in abilities. Like someone once suggested, I think all apexes should get their own signature move. It could get it’s own special healing ability instead of GEH, regenerating shields: a priority 1.5x heal that puts up a shield for 1 turn, tagets the whole team, has no delay, cooldown 2. And also trade the rampage for an impact, probably resilient impact.
For Mortem i completely agree with you. It needs 100% stun and vulnerability resistance and a bit more hp. But i also think It needs cleansing impact replaced with a special move: Devour: an armor piercing and defense shattering, 2x move that heals half of the damage dealt, and also grants a 25% attack buff after using It. It is a revenge move, has delay of 1 and cooldown of 2, no delay on revenge, cooldown the same.
As for Ceramagnus, the first thing i think is necessary is a nerf in damage. I think It should still be a high damage swapper, but no more than 1400 damage, and then a change to its kit and resistances. Imo It should lose stun resistance, too many resilients are immune to stun but i don’t see why they should be so good at countering each other, it’s fierce dinos that should be more resistant to stun, not resilients. As for the kit, I don’t think group accel is the main problem with It, it’s actually just the high damage output. Group accel helps It against cunning creatures and i don’t think that’s a problem, but that combined with a rampage is able to counter fierce creatures that It shouldn’t counter. So my solution is to keep group accel, but replace the rampage with cera’s own special move. Stampede: 1.5x attack, cleanse distraction and crit reduction, remove dodge and cloak, 75% chance to stun, apply vulnerability for 1 turn. Delay 1, coowdown 2.
Those are the moves i thought would fit them, but anyone feel free to suggest your own moves for them, i’d like to see interesting ideas If you have them