In regards to the volcano scene and the convo between Kaname and Kain … here another version of translation that I have from a friend fluent in Japanese.
Kain: The lava has been flowing for an extremely long time and does not stop. Is it all right?
Kaname: This amount will NOT cause a climate change. At the most this will only change the landform of the whole region into barren.
Kain: No … I’m thinking whether this mansion will be swallowed in one day … Ruka is also worried about this …
Kaname: At that time THIS MANSION will have been NO LONGER HERE … it will be all right. By that time I will make Ruka leave no matter how she will hate me. I’ll be sure to do so.
So my understanding is that the lava will swallow the mansion that they where in
causing changes in the worst case only to the landform around the mansion > region into barren
> so not a wide change.
Kain was worried if they were safe … he was worried if the lava would swallowed the mansion in that day as long as they were in the mansion.
But Kaname reassured him that when the time comes and the lava swallow the mansion he will make Ruka leave no matter what even if she’ll hate him for pushing her away something that calmed Kain’s worry about Ruka’s well being.
Also I understand that Kaname is possible to be there at that mansion when the lava will swallow it … for what purpose; unknown … but it gives the vibe that this will be at least very dangerous if not fatal as mariangie said with her scenario.
Or else what reason would have had Ruka for not wanting to leave thus Kaname would have to force her to??? Is she so attached with the building/mansion? Haha don’t think so … EDIT:OR
… Kaname was talking again in his cryptic way … his words are like divinations with many readouts hahaha
So maybe he was talking metaphorically like when the situation gets dangerous he will drive out Ruka i.e. it might seem that he was talking about the danger of the lava but he perhaps was referring in general that when the time come he will push Ruka away ensuring her safety even if she’ll refuse to leave from his side lol.
However I’m not sure that this mansion is the Kurans’ mansion although that the resin rose it is a hint which pinpoints to Kurans’ mansion >>
But my reservations are:
1. The architectural design of the lava-mansion doesn’t match with the Kuran’s mansion >>
2. Kaname had given to Yuuki an important key which seems to unlock the cabinet into his bedroom >>
If the key doesn’t have a known usage – and I mean where can be used – how Yuuki will know how and where to use it? There Kaname didn’t say nothing more about that key neither Yuuki asked him what unlocks … so I assumed that this key –at least literally- unlocks Kaname’s cabinet.
Back then my assumption was that the mansion which will be swallowed from lava was Hanadagi’s castle … at least judging from the architectural structure between Hanadagi’s castle and the distant exterior depiction that we had from the mansion/lava >>
- Hanadagi’s castle:
Plus Hanadgi’s icy shield … his castle was surrounded from icebergs so maybe the lava could be used to destroy that shield and melting the icebergs for good?
Well this is only a crazy idea of my wild imagination