Skill understanding

Judgement dragon does not require you to have lower than 50% HP. It doesn't have any HP requirement, as far as I can tell. I also thinks it only adds the critical chance to dragon skills since it does not show an increased critical chance in my stats.

Using Dragon skill increases critical chance and critical damage, and a chance to at least some of the physical damage can be switched on. However, more than half of the maximum HP is impossible.
\ N [Dragon Skills: Dragon Lore, Dragon sseuresyeo, Dragon Buster, Saekeuripayiseu]

You are correct, sir.

I'd assume the poorly translated skills are Dragon Buster, Dragon Fury, Dragon's Roar, and Sacrifice.

30% critical chance when using Dragon skills,
Increase minimum critical damage by 15%
5% probability of converting 5% of the damage dealt into health.