if u are lokking for item build my suggestion would be blink and foce staff
as batrider is initator hero so he initiate 1st in any ward
getting this 2 item is really important
and few item after that could be shiva guard or even some tanky item

depend on how well u farm and how well ur team reaction
force = escape mechanism when ppl attack u can still cast
blink = far ranged initator bad for escape as any damaged trigger u cant blink.

so depend on situation both almost same price so anything is good
for me blink 1st then only get force