Where does “heroaĵo” come from?

heroaĵo (Esperanto) comes from Esperanto heroo, from Latin hērōs, from Ancient Greek ἥρως, from Proto-Indo-European sēr-, from Proto-Indo-European ser- — to flow; to guard; to bind, to tie together.

heroaĵo (Esperanto): exploit heroic or extraordinary deed

Definitions

exploit heroic or extraordinary deed

Ancestry of “heroaĵo”, step by step

Step	Language	Word	Meaning
1	Esperanto	heroo	hero
2	Latin	hērōs	demigod, hero
3	Ancient Greek	ἥρως	a hero of the Trojan War: any of the major...
4	Proto-Indo-European	sēr-	to flow
5	Proto-Indo-European	ser-	to flow; to guard; to bind, to tie together

Every word from Proto-Indo-European ser- →Every word from Proto-Indo-European sēr- →Every word from Ancient Greek ἥρως →