The Mana Flare series is a line of buffs that add the Mana Flare Strike proc to direct-damage instant-duration nukes - it cannot function off DoT ticks. Chaotic Power, from the Call For Blood spell's recourse effect, is a 100% increase in spell damage that only applies to DoTs with a duration of 24 seconds or longer - it cannot affect instant-duration nukes.
Currently, these two effects overwrite one another, despite the fact that they exclusively affect completely different spell types. Given that the Mana Flare series is primarily obtained from LDoNs, and is available to Necromancers, is it possible to make this stackable with Chaotic Power? As it stands, it is pointless for a Necromancer to purchase Mana Flare II or III from LDoNs - the Chaotic Power proc is far more important and useful to them.