Time: 2:38PM PST
Frequency: Always
World name: Goblin
Character name: Fenced In
Monster name: Tried various level 2~3 and level 60~62 enemies
Class/Level: 62 AST
Party or solo: Solo

Steps:
1. Cast Earthly Star with an enemy in the area of effect
2. Wait for more than 10 seconds until you get Giant Dominance buff
3. Activate Stellar Detonation to trigger Stellar Explosion (or wait until Giant Dominance wears off)
4. See damage for the 200 Potency it is supposed to have on the enemy
5. Cast Gravity on a single enemy (Gravity has 200 Potency) and see damage
6. In my tests, Giant Dominance(Stellar Explosion) did ~2000 damage regardless of the level of enemy I had tried.
7. Gravity did ~2700 damage on the mobs I also tried on.
8. To note, Malefic II has a potency of 180 and was doing ~2500 which is still more damage than 200 potency of Stellar Explosion.
9. I am not sure if Stellar Burst with potency 150 is also incorrect

Conclusion: I am not sure if the potency text on the ability is incorrect or the damage(potency) is incorrect.