Doesn't look like using a dangerous firework is enough. I used legal, twin, enhanced and dangerous fireworks, then just now got the adventure and only got charred fireworks and fireworks shades.
It was just a guess. I used one enhanced, one dangerous and a couple of legal fireworks and got one sparkler, one firework shades and eight charred fireworks.
I also spent a lot of time at the docks, watching fireworks and fighting fireworks serpents. That might have helped. Or I might just have been lucky.
I also adventured on the docks long enough to see each of the fireworks encounters twice… didn't think to go etheric, though, so I didn't run into any serpents. Possibly the eternal sparkler had to do with beating those.
I fought many, many fireworks serpents. I got shades and six charred fireworks. I did not get a sparkler. Perhaps I spent too much time fighting those and not enough watching fireworks. (IIRC they replaced the fireworks, but I could have that wrong).
I used legal, twin, enhanced and dangerous fireworks
Twin? You mean multi-using legal fireworks, or is there some other recipe?
Huh, I thought someone else discovered it a few moments before I did, so I never went and added it to the wiki. Anyway, just made and used another, so the page is added now. Twin Firework, for crafting together two enhanced fireworks.
Is this consumed on use?
In fact … how does this wiki distinguish between consumable usables and non-consumable usables?
(and don't say "equipment"; first aid kit is also equipment and consumed on use …)
(and don't say "usable tag"; elegantly torn pants, midgard player and hungry ooze (for example) have that; and autodoc doesn't)
Usable items are presumed to be consumed on use unless noted otherwise. We're not always so good about noting things one way or another on item pages, though.
EDIT: You know, you could use this item to chip away at your hit points to get below 50% for shark tooth farming if you don't mind doing it a hit point at a time …