Nov Ganon

5D has full body invuln after the 5th frame, and I believe before the 19th, so just before it hits. Basically you want to use it whenever you think your opponent is gonna throw out an attack with a slower startup. Like for example, whenever a Jin hits me with B Icecar, I'm still in a standing state, so if the Jin tries to keep pressure by using 5C, Noel's 5D will go right through it. This situation happens about 80% of the time Jin lands a B Icecar :P