“It takes months for the drones to produce even a small amount, but it has unique properties. Some say that, in great quantities, it can even bring a member of the hive back from the dead.” - Khathandor, The Hive (GS-ADV3)

A substance produced by the Insectoids with healing properties.

One of many ichors.

When lit by flame, blue ichor becomes a glittering inhalant, to which some individuals are allergic;

You rub a small amount of the blue ichor onto the rubble. Then you set it on fire with the flame from your torch. This does nothing to clear the debris, but a glittering blue smoke fills the mine. The Dwarves happily breathe it in. As you inhale, you are filled with a sudden burst of energy, as if you’d caught a second wind. - The Hive (GS-ADV3)

You smear a small amount of the blue ichor onto a large wooden crate and then light it on fire. It creates a cloud of glittering blue smoke. Eregrun begins sneezing violently. - The Hive (GS-ADV3)