Here are some Ultra HQ Terrain / Environment / Rocks seamless alpha brushes
Terrain alphas and textures
DOWNLOAD HERE :
https://rapidgator.net/file/9cbc6710abb18319378069ac6b73b528/ArtstationUltraHQTerrain1and2.part01.rar.html
https://rapidgator.net/file/c93525ef34fabca54978f965d5c495f2/ArtstationUltraHQTerrain1and2.part02.rar.html
https://rapidgator.net/file/81a77db1fdce2053299101756d9e4e00/ArtstationUltraHQTerrain1and2.part03.rar.html
https://rapidgator.net/file/c7ebc5f808aff97c247feff9be3b9382/ArtstationUltraHQTerrain1and2.part04.rar.html
https://rapidgator.net/file/e29c0bf37ac30a05478dcb10d585ae97/ArtstationUltraHQTerrain1and2.part05.rar.html
https://rapidgator.net/file/4f36854a9cab78c44b4716fe45dfbdfc/ArtstationUltraHQTerrain1and2.part06.rar.html
https://rapidgator.net/file/a9eb2ff921bf14f242b37cbe37ecaa72/ArtstationUltraHQTerrain1and2.part07.rar.html
https://rapidgator.net/file/13ea2cef7375f629e7027db5e07ae4d8/ArtstationUltraHQTerrain1and2.part08.rar.html
https://rapidgator.net/file/8a44a30898845bdaf2d39a66349b6baa/ArtstationUltraHQTerrain1and2.part09.rar.html