Firith crouched down, using the scant protection given by the alcove to protect him from the worst of the debris. Pieces of ice and shards of crystals shattered and glowed from the random lightning strikes. The smell of ozone filled the air and steam hissed from where the crazed Sith’s attacks struck the ice walls.
Looking around Firith espied a crevasse in the floor that he might be able to duck into. Cautiously he moved forward along the wall, edging towards the hole in the floor of the cavern. He moved slowly, so as not to disrupt his cloaking. He could feel the ache across his back and shoulders from where he had rolled away earlier and knew he would be badly bruised tomorrow. Firith did not worry about the cut to the ear, it was superficial and had been bleeding only a little. Mostly it was the blast of lightning he had received that pained him more than anything. The nerves in his chest and abdomen where it hit felt like he had acid on his skin, and his armor chafed and rubbed making it difficult to concentrate.
“Fiiiirrrrriiiiitttttthhhhh, wheeere did you go? I have a gift, hee hee heee hahahaha, gift for yoouuuuUUUuuuu.” Macron said in a sing song voice.
Glancing back over his shoulder Firith saw the Adept peering around the edge of the alcove he had just vacated. Fascinated, he watched as Macron sniffed the air like a Akk dog searching for prey. “AHHHhhhhhh, I smell your fear, the burns on your flesh and, oh what’s this?” The crazy Sith giggled, crouching down and running a finger through a small red puddle on the floor.
Firith realized he was bleeding from the saber cut and had dripped blood onto the floor. In horror he looked down and saw tiny droplets spattered across the floor leading right to him. Looking up he watched as Macron traced the line on the floor with his bloodshot eyes and looked right at where Firith stood a few feet away.
Macron slowly stood up grinning, showing his sharpened teeth. Not breaking eye contact with where he knew Firith was he lifted his bloody fingertip to his mouth and slowly licked it. Blinking and making a face as if he had eaten something rancid or sour, Macron shook his head and spit. “Blah! Ugh, stale and old like you! I will not even be able to use your useless blood once I’ve gutted you! Killing you will do the Brotherhood a favor.”
Firith took a few more steps away from Macron, concentrating to keep his cloak in place and on his surroundings.
Macron reached down to his belt and unsnapped the safety cover of the blade he had on his hip. Slowly he drew the short sword from its sheath and began slowly waving it’s sapphire blue blade, making an almost hypnotic pattern. Firith could see an oily shimmer on the blade, he’d forgotten Macron liked using poisons.
“While I can’t use your blood, I may be able to use your lovely wife’s.” The Adept hissed and then giggled. “I remember her from our mission together, so full of life and vigor. Maybe after I have had my fun with her in my laboratory I will cut out her beating heart and eat it.”
Firith uncloaked and snapped his lightsaber on, rage filling his soul. “Ye’ll nae touch her, ye kriffen’ pile o Gungan shavit.” He growled, his accent coming out heavier than usual.
Macron smiled and then cocked and eyebrow as he felt his opponent's anger wash across him. “Oh my, I seemed to have upset you. GOOD, now you die, old man. Knowing I will despoil all you love and you failed to do anything about it!”
Screaming so loud that he caused damage to his vocal chords, Firith leapt forward in a wild and frenzied overhand strike.
Macron dropped his stance and shifted, angling his body to deflect the oncoming attack. Gracefully shifting away from the angry strike of Firith’s lightsaber, Macron slashed with his sapphire blade as Firith staggered past him. The razor sharp edge of the blade slit the cape and armor, scoring a line across the shoulders of the Dark Jedi.
Firith felt his left shoulder go numb and his arm go limp as the sapphire blade sliced ligament and muscle from the bone. Screaming from the slash, Firith whirled around as fast as he could and slashed his blade back at his opponent. Twisting his body back and around to the right he extending his arm. The wild swing caught Macron across the chest with the very end of the saber blade.
Losing balance and slamming into to corridor's wall. Feeling his left side tear apart even more, he collapsed to his knees. Looking up, Firith was dismayed to see his strike had hardly cut into the Sadow. Some of it having been partially deflected by Macron’s shield generator and armored chest piece. Most of it due to Macron's amazing reflexes.
Catching his breath, Firith got his feet under him and staggered again as all the colors bled out his vision and then snapped back in shades of neon. Macron morphed into a huge monster, the walls began to drip a poison green slime, the floor became black and tar like.
The monster stepped forward and Firith felt the claws puncture his skull as his head was lifted up to face his attacker.
“Goodbye, you were never worthy.” Macron said as he plunged the sapphire blade into Firith’s lower gut and sliced it up to his sternum.
Firith saw the snakes and worms come slithering out of his belly as Macron withdrew the gore coated blade. They writhed about, wrapping around his fingers. Looking up he saw Macron shift and morph into various people he knew. All of them laughing at him in derision.
Collapsing, Firith died a very cold and lonely death.
Syntax
So, normally we try to avoid commenting on dialogue errors because it could always be emphasis or a weird way of speaking. I need to bring up your use of ellipsis. Often times it can be used for one of two things: trailing off or omission. If you're using it to trail off, you wouldn't throw in a period after it. You may use it as an omission at the end of a sentence with a period, but in those cases the ellipsis would trail the period, not precede it. The other major issue throughout is that you never actually denoted who was speaking. I can assume that it is Macron throughout, but it is never made clear in any way. Each of your dialogue snippets were either started or followed by actions. This can be very confusing for a reader.
There isn't any need for a capital on "antechamber". It isn't a pronoun, rather just a place.
Should have a comma to break up the structure here. A good way of thinking about it is that if you placed "after all" at the beginning of this sentence, it would be followed by a comma.
Since you are using double quotes to denote your dialogue, it would be good form and easier on the reader to use italics to identify sounds within the narration.
You used the conjunction rather than the possessive form here. "It's" vs. "Its".
Story
This is a nice avenue for establishing knowledge of each other's characters and their relations.
This is a touch odd from a reader perspective, though I'm armed with character sheets to help out a touch. Macron is listed as 45 years old, while Firith'rar is 50. Not the greatest of gaps to be denoting one as an "old timer". Not marking down for it, but pointing out the confusion.
It's good to show that you're playing to the strengths of your opponent's combat aspects and not ignoring them. Nicely done.
This is a touch on the nose. We like to discuss the concept of "show, don't tell". This is an instance of "telling". Describe the effects to the reader, don't declare them as simply "cloaking". An example would be "Firith'rar let the ethereal shroud fall from around him, revealing his presence within the Force once more and no longer hiding him from sight". That kind of thing.