- Someone who is proficient with glassblower’s tools has not only the ability to shape glass, but also specialized knowledge of the methods used to produce glass objects. - **Components.** The tools include a blowpipe, a small marver, blocks, and tweezers. You need a source of heat to work glass. - **[Arcana](https://www.dndbeyond.com/compendium/rules/basic-rules/using-ability-scores#Arcana), [History](https://www.dndbeyond.com/compendium/rules/basic-rules/using-ability-scores#History).** Your knowledge of glassmaking techniques aids you when you examine glass objects, such as potion bottles or glass items found in a treasure hoard. For instance, you can study how a glass potion bottle has been changed by its contents to help determine a potion’s effects. (A potion might leave behind a residue, deform the glass, or stain it.) - **[Investigation](https://www.dndbeyond.com/compendium/rules/basic-rules/using-ability-scores#Investigation).** When you study an area, your knowledge can aid you if the clues include broken glass or glass objects. - **Identify Weakness.** With 1 minute of study, you can identify the weak points in a glass object. Any damage dealt to the object by striking a weak spot is doubled. - {{[[table]]}} - **Activity** - **DC** - Identify source of glass - 10 - Determine what a glass object once held - 20