The Lightning Sac is a Rarity-8 Monster Material in Monster Hunter Rise: Sunbreak and is used to forge and upgrade a variety of Master Rank weapons and armor. Specifically, this Monster Material is required for crafting gear pieces from the Zinogre Set X, Tobi-Kadachi X Set, Astalos Set, Knight Squire Set, and Khezu X Set. Additionally, Hunters need Lightning Sacs for upgrading specific weapons in Monster Hunter Rise: Sunbreak, including the Painful Razor+, Shockspear+, Khezu Skards+, Thunderblades, Guillotines+, Khezu Flute+, Khezu Shock Blade+, and Secta Du Yellow.
As the name of some of the Lightning Sac suggests, it is a Monster Material acquired from Thunder-type Wyverns, specifically the Khezu and Tobi-Kadachi. The Khezu is a pale, amphibian-like Flying Wyvern with a rubbery and fatty hide. More notably, this Wyvern has no eyes and uses its superb sense of smell to track down its prey. On the other hand, the Tobi-Kadachi is a Fanged Wyvern with extreme agility and an inclination for aerial attacks. Similar to a flying squirrel, this monster has a membrane between its limbs that allow it to glide towards its target in combat.
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The best way to get a Lightning Sac in Monster Hunter Rise is slaying or capturing a Khezu for a 21% chance of receiving the Monster Material as a Target Reward in Sunbreak. The second-best method is the 20% chance that carving a slain Khezu will yield a Lightning Sac. Conversely, hunting a Tobi-Kadachi only has a 14% chance of receiving the Monster Material as a Target Reward in Monster Hunter Rise: Sunbreak.
Khezu is weak to Fire-type attacks and susceptible to Poison, Fireblight, and Blast. This Flying Wyvern roars more often than
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