User blog comment:JmLyan/Dharma, the Enlightened Master/@comment-26870289-20150901043212/@comment-7481207-20150901091448

Yeah allies can screw with your karma gain on E if you lack communication (ideally, they should keep an eye on your karma bar to see what you're striving for), but it is also the only ability that can generate karma by casting it on yourself.

Naraka scaling with large monster kills is because junglers shouldn't technically get that many champion kills. That added to the fact that the duration is reset on each cast and the jungler most likely being a frequent target helps keep the duration in control.

And the passive are both selfish bonuses. Even though the AP does increase heal and shield strength, the AP increase comes at a cost of decreasing those ratios. And tenacity is not exactly a wasted stat on anyone, and I've been recommended to get on supports on a few occasions.