I can only remember two off the top of my head; several years ago I woke up and the name for a character I'd been struggling to decide on came to me, and yesterday in bed when I suddenly realised a way to increase the tension of the main plot whilst at the same time improving the flow of the story.
The latter requires quite a bit of extra writing and I'll need to spend some time planning it, but I'm quite looking forward to it. The extra bit will also present more opportunities for a little light relief. I don't want to alter the darker nature of Journey to Altmortis, but I've never subscribed to the theory that unremitting gloom is the best way to write. Even MacBeth had comedy interludes (the porter proclaimed that wine provoketh the desire and unprovoketh the performance, I think).
I'll probably wait until the first redraft is done before writing entirely new material. That should help continuity and give me a better idea of where new scenes/chapters can slot in.
Incidentally, thanks to all the readers who took the time to buy and read Bane of Souls and then came here. I appreciate your interest, and hope you like the site.