(taken from Slayers Universe)
Halshifom seems largely unaffected by anything Lina and the others throw at him. Bram Gush, Flare Arrows, even the Ra-Tilt end up doing nothing. Halshifom counters with a binding spell towards Amelia, "Shadow Web", which sticks her to the floor. Lina counters with a lighting spell to free Amelia, then casts Befis Bring to make a quick escape tunnel. Only... the tunnel goes down a LOOOOOONG way.
The group determines that they're gonna all have to attack Halshifom at once if they're gonna win. This thought comes to them once they get separated, though; Lina and Gourry are suddenly teleported away, while Amelia and Zelgadiss get captured by bugs. Lina and Gourry find that Zeigram, the guy with the mask, was their summoner. Then...
They sit down and eat dinner with him. o.O Lina realizes that there's been an awful lot of illusions running around lately, so she casts Flow Break to dispel them... and then leaves Zeigram's company. They make their way upstairs, where they see Halshifom... and a girl they saw in a picture earlier. She's hooked up to a crystalline device, which, in turn, is connected to several other pools, which contain bodies. Two look very familiar - Zelgadiss and Amelia.
Battle ensues. Zeigram watches from the shadows, and isn't really an active participant, until of course Lina smashes his mask in half. Halshifom seems to be linked to the mask, though, and starts aging at an incredible rate... or is it un-aging? In any case, Gourry leaps in to save Amelia and Zelgadiss from the pools, and... lo and behold, the girl is reborn. Halshifom goes to her and finds her to be an empty shell of what she once was, practically an emotionless doll. In his anguish and wish to be left alone, Halshifom Burst Flares the place, blowing everything up. What a way to go...
(taken from Slayers Universe)
Lina and Amelia seem to have made up their differences by now... but someone else comes to Lina with a problem. Odd, why's she got glasses on and a mask over her face? She steals something of Lina's and runs off around the corner... bumping into Gourry. She looks up at Gourry and... yep, you know what the music sounds like in the background. Anyways, she splits, and the group stands around wondering what all that was about.
Then they go to a nice inn. Lina and Amelia take a bath... and Lina, who was seconds before admiring her figure, notices Amelia's is better. (Even though she's a couple years younger!) And the disguised lady from before comes back as an inn attendant... once again bumping into and falling for Gourry. She tries to get some other item of Lina's, but misses them walking out as she says a long monologue.
Later that night, the girl tries again, sneaking into Lina's room. She steals Lina's headband, then Lina knocks her out of the room. She never woke up, though... anyways, the headband is used by this girl (who if you hadn't figured it out by now is actually Martina) as part of a curse. Whenever the cursed knife is stuck through something belonging to a person...
The curse is such that whenever Lina hits someone, the hit is magically transferred back to her. So you can imagine what happens, considering how many times she whacks Gourry for being stupid. Xelloss appears and helps Lina figure that much out. Martina reappears, sending a group of monsters after Lina, knowing she can't fight back without hurting herself. Eventually, though, the monsters get whittled down and Martina starts yapping. Then she drops the knife in her own foot. So now she is cursed too...
In any case, the curse ends up removed, and everything's happy at the end. More or less.