Pitch

Pitch, or tar, was a black resin that was used by laborers and spellcasters. "I find it ironic that even our most lofty edifices are held together by ground horse hooves, sandy lime, and foul-smelling tar."

- Excerpt from Aurora's Whole Realms Catalogue

Description
Pitch was stored in bottles, and often sold along with glue and mortar. The resin was very good at patching tiles and covering up leaks in roofs. It could be purchased from Aurora's Whole Realms Catalogue for 5 cp per.

Wood of Laspar trees were thick with pitch, and attempting to light it caused sparking. It was often used in candles or torches.

Usage
Pitch was very commonly used as a material component for spellcasting, particularly for spells that involved darkness. Some of the spells requiring pitch were: improved spider climb, darkness,  continual darkness, and maddening darkness.

Hip boots, which were also available from Aurora's Whole Realms Catalogue, were completely sealed in pitch to make them waterproof.

Pitch was used by mages to create or empower fire-based creatures. Burning man golems required pitch as an essential part of their construction. The spell, enhance fire creature, also required pitch.

History
Those of the Flamedeath Fellowship used flame knives that were covered in pitch.