Making this for people who don't know, and because I've kinda always wanted to just geek out in an explanation thread 
But anyway, back when the first teaser trailer for The Force Awakens came out, a LOT of people complained about Kylo Ren's crossguard, and said it made no sense, design wise. (Pointing out that the emitter shrouds for the crossguard prevented it from being an effective form of defense)
But there is a logical explanation, that I've read about, and it cheeks out.
That being, that it's not meant to be a crossguard. It's designed as one, but that's not the purpose of it.
Kylo's lightsaber uses a cracked Kyber crystal (a lightsaber's power source)
And well, as a result, the blade is unstable, this can be seen due to the crackling/serrated appearance of his blade
As opposed to the more solid appearance of a standard lightsaber
Now some of this is from the EU/Legends canon. But I don't see why it wouldn't still apply.
But the idea is that an unstable lightsaber blade is more powerful, and, rarely, can cause standard lightsabers to malfunction ("Breaking the blade" a rare but possible occurrence).
The downside is, true to their name, they're unstable, and they could short-circuit due to the excess power.
What does this have to do with Kylo Ren's crossguard? Like I said, it's not really a crossguard, they're vents to compensate for excess energy designed in the appearance of a crossguard.
Hope this was informative, and thanks for reading

But anyway, back when the first teaser trailer for The Force Awakens came out, a LOT of people complained about Kylo Ren's crossguard, and said it made no sense, design wise. (Pointing out that the emitter shrouds for the crossguard prevented it from being an effective form of defense)
But there is a logical explanation, that I've read about, and it cheeks out.
That being, that it's not meant to be a crossguard. It's designed as one, but that's not the purpose of it.
Kylo's lightsaber uses a cracked Kyber crystal (a lightsaber's power source)

And well, as a result, the blade is unstable, this can be seen due to the crackling/serrated appearance of his blade


But the idea is that an unstable lightsaber blade is more powerful, and, rarely, can cause standard lightsabers to malfunction ("Breaking the blade" a rare but possible occurrence).
The downside is, true to their name, they're unstable, and they could short-circuit due to the excess power.
What does this have to do with Kylo Ren's crossguard? Like I said, it's not really a crossguard, they're vents to compensate for excess energy designed in the appearance of a crossguard.
Hope this was informative, and thanks for reading
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