Alright! I'm cautiously optimistic that we can handle this fight while remaining in good condition. While Ling Qi doesn't normally tank and distract an opponent, we have demonstrated the ability to take multiple powerful strikes without falling unconscious in the Outer Sect Tournament with Ji Rong. Now, we have advanced a level of SCS since then, and this is in complete darkness which is our strongest suit.
The Impure Antlion will have difficulty grabbing us due to the multiple ways we have to avoid being grappled. Additionally, while this terrain would normally convey a steep advantage to the Impure Antlion, SCS pretty much allows us to ignore the terrain penalty here. TRF will be able to soak up an early hit or so while we dance around the thing and keep its attention focused solely on us.
Given that the Impure Antlion is an ambush predator, I feel that its defenses will be weaker than its offense. Which should help us blast it down to size with FSS. Hopefully, Li Suyin has some nice formation work to assist us in bringing the creature down. Bombs or some of the exploding needlework that she showed in the out sect vengeance spree. It'll be interesting to see how much damage we can avoid using SCS and TRF. Also, FSS's debuffs from Spring's End Aria and HC should help keep the Impure Antlion from doing anything crazy.
Assuming we are able to defeat and kill the Impure Antlion, it will be interesting to see what reagents Li Suyin is able to get from it. The core, the mandibles, and the exoskeleton should all be pretty interesting materials to work with.