Abere
Amhara lost tribes are on the other side of Semien Shewa zone not arsi welega. Amhara people were conquered as well as dozens of other tribes were killed and put down. having language ban and identity destruction was enough to wipe out Ethiopia diverse tribes whic included 130 or more
The old source states Gerarya and Selalesh being entirely Christian Amhara, while crossing Mugar river the source verifies Mugar was home to the pagan tribe of Gaffat.
Don’t forget this area today still borders Amhara region and is Christian