....
Shin fell on a deep thought as he consider what are the pros and cons of upgrading a skill.
"Hmm.... Base on the discussions on the forums, an Epic Tier 1 Skill is almost equivalent to a Basic Tier 2 Skills. And promoting a Tier 1 Skill to Tier 2 Skill cost some Legacy Points instead of ordinary Skill Points."
"But even of an Epic Tier 1 Skill is strong, it still have a long cooldown, so I can't just blindly upgrade a Skill to Epic Rank to prevent myself from running out skills in battle."
"Wait, I remember reading an article in the online forums stating that there are some Skills that will not get a long cooldown when it is upgraded to Epic Rank."
"And most of them are movement skills and execution skills. There are also some damaging skills and most of it are Self-Created Skills."