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Please be advised that if you use the connect app, it doesn't always correctly parse links to lemmy posts. If they're not working for you, you can follow the whole plotline on my site. (These comics are in reverse chronological order, so start at the end and work backwards.)
Konsi made these sending stones herself, with the Forgeringer (it lets her make magic items.)
Yes, it takes longer than a day to make Sending Stones - even with the artifact hammer a pair of sending stones takes her about ten days. She'd already made them before being asked on the date, but had been too nervous to show Razira.
Oh yeah, a really good use of the dream spell is when you have to have a discussion with an NPC long-distance (say, to brief them on a situation.) - If it's just one way, the lowest level spell for "give a lot of information long distance" is to Galder's Courier a letter to them, but dream is two-way.
It's also on the warlock list.