Growth Bombs

Growth Bombs refers to special explosives utilized by Lord Zedd in season 2 of Mighty Morphin Power Rangers as well as by Gorma Tribe in Gosei Sentai Dairanger to grow their monsters as means to escalate their fight against their enemies.

Description
A Growth Bomb takes the appearance of a metallic sphere-like grenade with a small round pin on the top. Though not confirmed, the Bomb's filings possibly comprised of volatile chemicals/concoction which enlarge those who exposed to it, though said concoction/chemical must be ignited at the same time to achieve such effect. For that, the pin is designed to create a friction to trigger the bomb, which mechanics seemingly not too different with hand grenades.

Although the Bomb supposedly designed to enlarge a single monster, the released explosion of fiery energy revealed to have enough power to enlarge two at the same time as demonstrated by both Goldar and Scorpina, provided that they are within its blast radius.

Whenever his monsters ended at the losing ground in the fight against Rangers, Lord Zedd will materialize one of these explosives on his right hand, which then hurled to Earth for the monster in question to use straight from the Moon Palace. Interestingly, the Growth Bomb somehow not ignited by the heat from entering Earth's atmosphere and even lands within recipient monster's reach, suggesting enchantments were involved in its creation. Same enchantments also keep the Bomb warm during re-entry since the recipient monster immediately caught it without signs of discomfort.

History
It's not confirmed whether Lord Zedd developed Growth Bombs himself as means of growing his monster army or having an alchemy servant (possibly on Finster's level) developed it on his behalf, nor whether the Bombs have underwent some improvement since its development into latest variant Emperor of Evil utilizes in the fight against Mighty Morphin Rangers. One of the Bombs' earliest users on earth was Primator.

The bombs would later rendered obsolete by the time Lord Zedd and Rita's relationships improves and even became a couple, as the two combines evil magic of their staff to fire a spell to grow their monsters together to Megazord-size.

Trivia

 * In Gosei Sentai Dairanger, monster commanders of Gorma Tribe usually equipped themselves with at least one of these bombs so they can immediately use it upon needed.