Archeologists have discovered many tools left behind by prehistoric civilizations.

The incredible find was discovered in the megalithic tomb of Montelirio tholos, which is located in southwestern Spain.

This enormous site is made from large slate slabs and stretches over 143 feet.

Prehistoric Crystal Dagger Blade from Montelirio Tholos

In addition to the dagger, they found 25 arrowheads and cores for making the weapons.

What was found in the Montelirio tholos?

The remains of at least 25 individuals were found within Montelirio tholos.

Prehistoric Arrowheads Made from Rock Crystal

Previous analysis has suggested that at least one male and several females died from ingesting poison.

It was found on its own in a separate chamber, in association with an ivory hilt and sheath.

Measuring nearly 8.5 inches long, it’s similar in shape to other daggers of the period.

Prehistoric Crystal Dagger Blade from Montelirio Tholos

They probably represent funerary paraphernalia only accessible to the elite of this time period,writethe researchers.

Prehistoric Crystal Dagger Blade from Montelirio Tholos