Skill checks in lab:
Circle: Spellcrft DC 20 (1d20+13)[26] +(1d6)[1]

Formula: Spellcraft DC 25 (1d20+13)[18] +(1d6)[2]

Dust: Perception DC 20 (1d20+9)[29]

The Bloody Symbol: Sense Motive DC 20 (1d20+6)[19]

Knowledge Religion (1d20+10)[14]