Benefit(s) The alchemist can infuse her bombs with a special unction that damages incorporeal creatures and reveals the presence of undead creatures hiding in the area. Incorporeal creatures struck by an ectoplasmic bomb take full damage from the bomb. In addition, squares in the affected area of the bomb begin to faintly glow in the spaces where undead creatures have traveled in the last minute, including undead benefiting from invisibility or other forms of obscurity (such as ethereal jaunt), effectively creating a glowing trail. Any undead creatures in the affected area at the time of the explosion likewise glow faintly. This glowing effect lasts for 1 minute, and is otherwise identical to faerie fire.
Pathfinder Player Companion: Undead Slayer’s Handbook © 2014, Paizo Publishing, LLC; Authors: Dennis Baker, Jay Loomis, Alex Putnam, Adam Roy, Tork Shaw, and Larry Wilhelm.