Came up with a few more combos to be added to the mega combo list.
[Corner Combo]
214D[CH] > 236C > 5CxN > 6C> 214D > 5CxN > 6C > 236D > 214D~C > 2DD > jDD > j2DD > dj > jDD > j2DD > Calamity Sword ~ does about 6600 damage. The timing's are a bit tough in the middle of the combo. The 5CxN after the second 214D needs to be delayed slightly or else the 236D will miss.
This one is a bit impossible to do online I think but I believe it's Lambda's highest (so far).
[Corner Combo]
214A[FC] > 236C > Calamity Sword > Rapid Cancel > 5CxN > 6C > 214D > 5CxN > 6C > 236C > dash under > 5CxN > 6C> 236D > 214D~C> 2DD > jDD > j2DD > dj > jDD > j2DD > Calamity Sword ~ does roughly 7100 damage and requires 150 heat (100 to start it and you generate 50 exactly to finish with Calamity Sword).
The beginning part of the combo, right after Calamity Sword hits, you have to do the RC immediately, any amount of delay and you'll miss several swords in 5CxN and mess up the combo. The timings for this combo are fairly strict, in that any slight delay results in blue beat, and it works on smaller hitbox characters.
If anyone has any higher damage dealing combos let me know. I'm curious how high the new Lambda can get in terms of damage.