User blog comment:GreenMoriyama/Nine, the Magus of Elemancy (collab w-Lesdin)/@comment-7709681-20170913024132/@comment-3391671-20170913160921

Does lead to clarifications that we should have set out to define. I personally find that Garnet's DoT does not stack, neither is it enhanced by Cardinal Nova's damage multiplier. Will make note next time I personally chat with Lesdin that we get this (and other aspects) clarified.

And... I assume that what you are saying is that Sapphire and Emerald looks like they stack too? If that be the case, multi-casts of the same element does not have their effects stack, both as Cardinal Flare and as Cardinal Nova. Thinking about making a diagram to represent how they look/work.