DRK - Multiple bugs.

[Valonir]

ISP: Comcast
Type of Internet Connection: Cable
Internet Connection Speed: 20Mbit/s
Date & Time: 6/30/2015 @ 11:53 AM EDT
Frequency: Always
Character Name: Yishunsen Mol
Race: Au Ra Male
World: Balmung
Class/Level: Dark Knight 60
Area and Coordinates: Mist (9,10)
Party or Solo: Solo (Party to test)
NPC Name: None
Monster Name: None
In-Game Time: 9:45 AM

Steps:
1) Have a friend cast regen on you, or be tagged by enemy poison. MP is drained based off Heal over Time effects or poison ticks (thus resulting in faster MP drain than intended).
2) Using Dark Arts with Dark Passenger only blinds 1 enemy monster in a group.
3) Using Dark Arts with Abyssal Drain only drains the health of 1 enemy monster in a group.

Further editing on viewed bugs:

Mana is drained when buffs are used and then eventually fall off. This does not seem like intended behavior.