Olag-Hai

The Olag-Hai were a race or subrace of Trolls, described in Appendix F of The Return of the King.

The Olag-Hai appeared at the end of the Third Age. They were bred by Sauron. Unlike most trolls, they were immune to being turned to stone by the light of the sun. They were also far more intelligent than other trolls, and it was speculated they had been interbred with orcs and/or men for these effects.

The Atlas of Middle-earth claims that the force of trolls encountered by Beregond and Pippin in front of the Black Gate were Olag-Hai. These trolls wore dark scale male, and wielded hammers and bucklers in battle.

In The Lord of the Rings: The Battle for Middle-earth game, the "Half-troll marauder" unit has significant similarities to the Olag-Hai, however, they fight with pikes rather than hammers.