Skill states (in summary) that Smashlord takes 50% loss to his HP and attacks the enemy. Damage inflicted is equal to 50% of his max hp. Attack is never critical.

I have 51,000+ hp and his A3 is doing 28,493 damage to himself, but the enemies are only hit for 9k to 12k damage each. This attack cant crit, ignores his own def and shields, potentially kills Smashlord, but then is mitigated by enemy defense. The skill is already so restrictive I assume it is not working as intended.  If it is then remove the no crit restriction, but I believe the skill should just ignore enemy def and deal the flat damage.