evilleet said:You're right seems impossible since they only happen all 1000 years.
216 years actually, 1000 years is the delay for incarnation ceremonies.
evilleet said:But it would be a good place to open a way to the Vortex.
Why? Opening a way to the Vortex of Souls isn't a very good idea, and SK (the only one that can do this as far as we know) can theorically open one anywhere.
evilleet said:On top of the nearly destroyed Tower Guts and Griffith fight till they both are dying. Guts triggers his Beherit and goes directly to the GH. Skullnight uses his Resonance Sword to get there and then.. i have no idea
You can't just trigger a beherit when you want to, you know. Besides as you said, the whole thing wouldn't be very plausible at that point. Doesn't hurt to post your ideas though, write more if you have any.
On a side note, SK's sword has nothing to do with resonance (that's a mistranslation). Since it's hard to find a good name for his Yobimizu no Tsurugi technique in English, I recommend you to just call it "beherit-sword" for lack of a better term.