[1.2.288] "Legend" Skill Strings

whats up with the mp usage on the skill in the 6th job? the mp goes up to 45 then back down to 40....

Its an "Assassinate" skill.

Here shadowers version (from HS.net):
Level 25: MP -45, Attack 110%, for 12 secs, accumulative damage, Critical Damage 225%, for success rate 80%

Level 30: MP -40, Attack 120%, for 12 secs, accumulative damage, Critical Damage 250%, for success rate 90%

Basically the same.