Energo weapon

Lets just face: the Dinobots like to kill things. They like it a lot. And they like to get up close and personal when doing it. But there are times where teeth and tail just won't cut it. When that time comes, the Dinobots will usually use their energo-swords.

Except for Swoop, who uses a thermal sword. He likes to be different.

Fiction

Generation 1

Marvel comics continuity

Sometimes me Grimlock eat enemies. Other times, me Grimlock slice them. It depend on how me Grimlock feel.

Ratbat led an ambush on both Fortress Maximus and Grimlock's respective Autobot contigents while Grimlock and Blaster dueled for leadership on Earth's moon. While the Decepticon forces overwhelmed the Autobots on the surface of the moon, the island base attacked the Autobots from above, protected by a force field. However, Grimlock's energo-sword was able to cut through the force field, allowing Blaster to shoot the island base with his Electro-Scrambler, forcing a Decepticon retreat. Totaled!

Later, Grimlock fought off some Demons with his energo-sword after becoming an Action Master. Much fun was had. Except for the Demons. Still Life!

Cartoon continuity

Apparently, Snarl's energo-sword can fire energy blasts. He did this when the Constructicons attacked the Autobots base in an attempt to destroy Teletraan I. Heavy Metal War Later, after going to Dinobot Island, Snarl used the energo-sword to for shooting at rocks during target practice. He needs to work on his aim. Dinobot Island, Part 2 Likely due to censorship policies, the energo-swords were never used for traditional hacking and slashing, which completely and utterly sucked.

Dreamwave comics continuity

While searching for Optimus Prime, Grimlock used his energo-sword as a grapple to lower himself down a chasm. That's pretty handy for a weapon. Later, he shoved the energo-sword into the Autobot leader's hands, telling Prime to prove himself by killing Megatron, or Grimlock would kill him. The War Within, Part 5 Optimus Prime used the weapon to beat Megatron senseless, but spared his life and left the energo-sword behind. Considering the fact Optimus Prime wasn't immediately slagged, it appears that Grimlock didn't really care. The War Within, Part 6

After learning that Jetfire was meeting Shockwave in the Neutral Territories, Grimlock decided to kill them both and attempted to use his energo-sword to decapitate Jetfire. When the Fallen appeared, Grimlock tried to destroy him, but the Fallen merely grabbed the energo-sword's blade with his bare hand. Sometimes, it really helps to be on fire. The Dark Ages, Part 4

Transformers Animated cartoon

After Grimlock and the other Dinobots were hidden on an island in Lake Erie, Grimlock discovered his ability to transform and drew a new weapon: a flaming energo-sword. He decided that he liked the results. Blast from the Past

From Teletraan I: The Transformers Wiki, a Wikia wiki.