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In Episode 19 - _The Lugru Corridor_ , Kirito and Leafa are blocked from
entering Lugru by Salamanders and are forced to fight with them. In the middle
of the fight, Yui tells Leafa to use all her magic to heal Kirito from the
damage of the incoming barrage of Fire Spells, while Kirito is chanting an
Ilusion Spell that Leafa taught him when they entered the corridor.

Kirito turns into _The Gleam Eyes_ from Sword Art Online and begins to kill
everyone (save one Salamander who Kirito then bribes with the loot he just
got, while another fled by diving into the lake, only to die).

Leafa explained previously that Spriggan's spells are mostly useless in
battle, and by definition Illusions shouldn't damage enemy players or even
kill them (unless they are intimidated and back off falling into an abyss of a
monster filled lake). If they could do damage, they'd technically be
summoning/conjuring.

Kirito isn't a hacker who made Leafa, Yui and all the Slamanders think that a
giant beast was throwing them about, when really he was just stabbing them.
And in Sword Art Online, Kirito didn't have any sort of summoning abilities
(at least in the anime). So how did Kirito's Illusion pick up, throw and kill
the Salamanders?


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sword-art-online
How did Kirito's Illusion actually kill?


Rather than an illusion magic, it seems what Kirito used is a transformation
magic instead. The following is based from the 3rd novel.

> "Well, I somehow remember the battle earlier. I used the magic Yui
> suggested, and became very big. Since my sword disappeared, I had to use my
> hands..."
>
> "Also with the teeth bite yo~"
>
> On Lyfa's shoulder, Yui added with pleasure.

Remember that Yui is an AI from Aincrad and that upon arriving at the Alfheim
world, Kirito noticed that Alfheim is based on Aincrad, including the skill
sets and player data.

> In the skills window, I saw several skills side by side. These skills
> included: 1-H Swords, Unarmed Skills, and Parry, the Combat skills, as well
> as Fishing, a support skill, but the proficiency values were abnormal. More
> were just about 900, and some had even reached 1,000 and had a tag denoting
> MASTERY.

Later when asking Yui, Yui confirmed that.

> "It seems this world is based on a copy of the Sword Art Online server."

This explains how Kirito can turn into The Gleam Eyes. Since it is a copy of
the SAO, some resource file might be still left intact. While it is not
normally accessible by the players, with Yui giving assist, it is possible
that she hacked the system a bit and granted access to Kirito to transform
into The Gleam Eyes. This wasn't explicitly mentioned in the novel, however.


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Let's not forget that the Salamanders' remain-lights were extinguished as soon
as they were formed. This means that Kirito also got the special stats of the
monster he became. GLEAM EYES was the first _demonic_ monster the SAO players
faced, according to the wiki. In Alfheim this must mean that any damage a
demonic monster does cannot be healed by magic and anyone it killed could not
be revived, thus they all faced the penalties for dying in Alfheim with _no_
chance of escape through revival. **That's** pretty terrifying if you ask me.


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It is a spell called metamorphosis. Here's the description from the wiki.

"Once the incantation is completed, the spell turns the caster into a monster.
The shape of the monster that the player is transformed into depends randomly
on the player's combat skills. However, this spell is not popular, as the end
result is usually a weak monster with no change in stats, thus it is usually
not viable in actual combat."

It is also an illusion spell.


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From the scene, it seems implied that Yui had worked out a plan with Kirito to
turn into the Gleam Eyes monster ("Do it now Daddy!").

It obviously isn't an illusion - he was killing other players with it. The
only possibility you're left with is that although Sprigins normally have only
illusion magic, he had a special ability which gave him access to transform
into to this beast.

Since Yui could not hack the systems as was mentioned earlier, the best we can
say is that she recognized that he had higher level magic skills in his
inventory that could be used to his advantage. And although Leafa was
generally aware of what Sprigins were capable of, she may not have been aware
of what one at Kirito's power levels were capable of.

Thus I'd say he had the ability to transform into a real monster, given his
ability, and perhaps Yui pointed this out to him and he made use of it.


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