Being
Goblin Squad Member
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I suspect it's more of a matter of either creating magic items or researching spells already encoded into the game.
After all to create a new original spell would require that Goblinwerks actually code it into the game.
Oh of course. The way I was imagining it might happen is, first, it would have to be something a very advanced wizard might become capable of. That would give GW time to figure out what could be combined to produce what effect, and make that combination possible. Then, say on the body of an escalation boss, a scrap of parchment was found containing a glyph or a line from an incantation.
Find enough of them and the wizard could attempt to make something of his collection. When he hits on the right key, presto! A new spell for his grimoire!