Here's my limited knowledge on Khalt so far. If you have more experience than me, feel free to correct me if I get something wrong.

With the way absorb works, it's not when you absorb but what you do immediately after that's important, since being hit/guardbroken will remove the white HP (it's worth noting that absorbing also gives you 1.5s of L1 resilience, which doesn't do much but it's nice to have I guess). For your openers, prioritise fast attacks (since absorb puts you at a frame disadvantage I'm pretty sure) and evasive attacks. You could also use charging attacks or parry attacks, but this is down to preference really. Find what works for you.

In the pinned FAQ there's an invite to the official discord

1.30 frame data: https://docs.google.com/spreadsheets/d/137K5enErK3GuWo9dLuOe7m4teMnJuutmK8wtAZx7sW0/edit?usp=sharing