Currently I'm blackholing and rejecting some traffic with route add -reject/-blackhole <address> 127.0.0.1; this works fine, but bounces all the rejected/blackholed traffic to the loopback interface. 

This behaviour is.. annoying, and possibly ineffecient. I'm probably searching for a null/blackhole/fake address/interface. I tried creating an unconfigred pseudo-device, slapping an IP address on it and routing it to there; it blackholes traffic effectively, but also blackholes traffic if you have a reject. 

What is a better way to reject/blackhole traffic in OpenBSD?