There are a few main differences between a herald and a return.for one, there can only be a certain numeric of heralds at one time (i believe it was 1,4, and 10 that can exist as once). Second, returned don’t get an honorblade, and heralds don’t get a divine breath or an equivalent splinter. Also, returned are far less invested than a herald. And heralds don’t need to consume investiture to sustain themselves. Realmaticly speaking, returned are cognitive shadows stapled to a body via their divine breath, which is a splinter of endowment, while heralds are cognitive shadows whose bodies are synthesized by the oathpack out of honor’s investiture.