We can obtain the basic Nawacore from the Agent Npc near the Nahar City gates.
He will ask either 10k sweat or kill 100 tabtab.
Once we have the basic Nawacore, the same Npc will offer us to upgrade it to Nawcore Mk2.
To do this we should collect 5 NawaCore Mk2 fragments: A, B, C, D and E...