Eitri is one of the secondary tritagonists of Avengers: Inifinity War. He was played by Peter Dinklage, who also portrayed Tyrion Lannister
Attacked by Rock Trolls
Eitri and his people were close allies of the Asgardians, to the point of even creating the mighty weapon Mjolnir after being asked by Odin to forge it.
When the Bifrost Bridge was destroyed, the Rock Trolls, having coveted the Dwarven Forges for many millenia, attacked Nidavellir knowing that Asgard could not come to defend King Eitri and his people. Using the power of the Tesseract, Heimdall was able to rebuild the bridge and aid Nidavellir; as a result, the Rock Trolls were defeated by Thor and the Asgardian army.
To be added