Ghost Song

This was one of the most difficult fights in the game for me. The best weapon I've found for this fight is the Skab Device module. It can be found in Rote-Shotter, in the top level, west room, all the way to the left. You will need to break some hidden walls to access this room, and the module within. Reference this map for help locating it - https://drive.google.com/file/d/1UhOfoCHSfdHQromVsi8UhYi7YMa...

This module launces bugs that do constant damage, which also helps when Henriette starts spawning yellow spores. Having help with the spores while whittling away at her health made the difference for me with this fight. You will know you are near the end when she launches a charged spear at you (looks obviously different that the rest of her spear throws). If you have the Liferun module from Six-Finger Woods, that can help keep your special weapon charged since the boss room is big enough to use effectively. I completed this fight without Liferun though. I only used Skab Device and the regular blaster. Keep bugs constantly attacking and use the blaster during the brief moments between attacks. Learn the attack patterns to dodge effectively and you shouldn't have much of a problem. Good luck!