DRK - Multiple bugs.

[Slinkpit]

ISP: PTV Telecom
Type of Internet Connection: Fiber
Internet Connection Speed: 100Mbit/s
Date & Time: 6/30/2015 @ 19:00 GMT+2
Frequency: Always
Character Name: Lexington Xer'ath
Race: Au Ra Male
World: Ragnarok
Class/Level: Dark Knight 60
Area and Coordinates: Everywhere
Party or Solo: Both
NPC Name: None
Monster Name: None
In-Game Time: Any

/ Confirmed Bug \
Using Dark Arts with Dark Passenger only blinds 1 enemy monster in a group.
Using Dark Arts with Abyssal Drain only drains the health of 1 enemy monster in a group.

About MP "Inusual" drain:
EDIT: Testing right now with a DRK 52 and when i use regen on him or any other buff i dont see him losing more MP than usual Dark Side do
EDIT 2: Second test with a WHM friend and myself DRK60 in Idyllshirne and inside dungeons he casting regen and more buff on me and i dont lose mp quicker than before
EDIT 3: With dx11 i dont have this inusual mp drain tick but i find i have this issue with dx9. Its seems a client-side problem?

[Renault]

ISP: Service Electric
Type of Internet Connection: Tether
Internet Connection Speed: 50Mbit/s
Date & Time: 6/30/2015 @ 1:48 PM EST
Frequency: Always
Character Name: Stefan Delumiere
Race: Hyur Midlander Male
World: Balmung
Class/Level: Dark Knight 60
Area and Coordinates: Everywhere
Party or Solo: Both
NPC Name: None
Monster Name: None
In-Game Time: Any

Steps:
1) Activate Darkside
2) Acquire a buff from another player
3) Watch as MP is drained by buff application and removal
4) HP regens will drain MP with each tick