What effect did the black death have on medieval europe?

it killed lots of people also tribes used to use infected bodies and launch them over walls into castles to infect the castle and kill the people inside

The Black Death changed the demography of Europe substantially. Aside from the Plague deaths , there was also a decline in the birth rate. The net result was that by 1400, Europe's population was half what it had been in 1345. This is known with some accuracy from many Medieval church, census, and tax records that have survived. Europe's population took about six generations to recover