General Grievous' Gutsack

TCG Card Number: 3SWG6

A pressurized cyborg gutsack whose nutrient-rich fluids are capable of enhancing a person's learning capabilities when ingested. Draining and drinking from the gutsack will provide a 20% increase on experience points earned within the one hour duration. If you are level 90, this loot will grant you one random collection item. This item is consumable.

Star Wars Lore
Pursued by Obi-Wan on a varactyl named Boga, after a prolonged chase and running duel, the two crashed onto Grievous' private landing dock where the Soulless One' waited. As they fought hand-to-hand, Grievous showed that he was the better melee fighter, making use of his mechanical body and superior strength. However Kenobi managed to rip open Grievous' previously damaged chest plates, revealing the synth-skin gut-sack containing Grievous' remaining organs. After striking him a few times, Grievous tossed Kenobi off the platform, but the Jedi managed to catch hold of the edge.

Grievous, deprived of most of his arsenal, picked up a electrostaff and charged at Kenobi, raising the staff to finish him off. But before he could deliver the killing blow, Kenobi used the Force to summon Grievous's personal blaster to his outstretched hand. He fired five shots through the gap in Grievous' chestplate into the general's gut-sack. The oils preserving Grievous' organs burst into flames, incinerating his remaining biological components and killing the famed cyborg.

Source
Grievous on Wookieepedia.