As a nightblade if I use swallow soul, and blood craze will I receive the heal from both of these?
I also know blood craze isn't great but just for leveling until I get power extraction
You can stack different types of heals but the only single heal I know of that stacks on top of itself is healing springs/whatever the other morph is called. If you're a templar and you do "the clap" heal (I forgot the name of it) and you choose the one with the small HoT at the end, those will stack at 8 second intervals.