That new fucking boiler acid HIFA is hella strong. As a marine main who refuses to play xeno, I tell ya, any and all acid hurts and with this stuff theres no dodging instant HIFA acid bombs. Even if it aint killing marines it will wound and slow them and make life suck for them, which will get them killed, as you rapid fire that shit off at them. So its really good in the caves if you know how to position yourself. Stops unga's really good since they'll run out of their pain stops and firstaids pretty fast dealing with you.