The Firseid Sandbox
Oberon's oil of concealment
This thin, oily substance resembles quicksilver and turns things partially invisible
Once per week, a user may coat themselves and up to four of their companions in Oberon’s oil of concealment to turn them translucent. Subjects rubbed with the oil gain concealment (a 20% miss chance, and a +2 circumstance on sneak checks when not moving) for 4 hours or until they are doused in any sort of liquid. This effect is countered by see invisibility and true seeing.
Like many of Oberon’s gifts, the use of this item may carry a hidden price, especially for anyone who attempts to take the oil with them out of the Faerie realm.