its worth learning how to do b2, b2, b14~LRC in the corner, you can get big damage starting combos this way, (usually 40+%) and you can do it meterless. The combo
@Train listed above is a good option, but it is always good to have something in your pocket that doesn't require a bar. There is no way around the raw lab time needed to get this down. This is something that is necessary to have in your toolkit even if you don't use it all the time. The damage is one important aspect, but it is important to remember that this allows you to play safer as well. This is especially important against vortex characters where you really have to make the most out of damage conversions.
@Black Chapters keep at it, getting this down in the corner was the hardest part for me. I also suggest learning Exdb3, b14~LRC. Using one bar, you can get a combo punish off of wakeup. If you need to recover stamina, using things like f12b2, b14~bf3, and b33~bf3, or ji3~bf3, are reliable, easy, meterless bnbs that can buy you some time, and momentum while you recover meter. Being able to keep up pressure while managing your stamina is just a part of playing thunder god. The cancel is even more powerful if you can get them to waste their meter. That way, you can maximize combo damage when they don't have the meter to break.