Fluffernutter

"Fluffernutter" is the party's code word for the attack devised by Nott and Jester. It originally consisted of a small wooden keg filled with black powder, which was lobbed and hit by a flaming or explosive projectile.

History
Nott created the first fluffernutter when she stole a small keg of black powder from Avantika's ship. She and Jester proposed using it (and named it) against the Yuan-ti abomination while in the Temple of the False Serpent on Urukayxl, and actually did attempt it against the hydra, but missed. Nott was able to recover the keg and used it successfully for the first time during the subsequent pursuit, with Caleb using Scorching Ray to explode it.

Nott created her second fluffernutter while in Rosohna, this time in the form of a pouch.

Similarly, Veth created what she hoped was a depth charge by installing a waxed fuse into a cask of black powder, thus eliminating the need for a projectile to hit it in order to create an explosion.

After losing the Bag of Holding (where the fluffernutter was apparently stored), Veth purchased the components for two "comparatively powerful" new fluffernutters in Rexxentrum, and was able to later craft them with Yeza's help. One of them was made on a skill check of 28, and Matt told Sam to note it with an asterisk in Veth's inventory.