Rebirth as a troll: beautiful elves all become my slaves

Nick comes back to life in a world full of magic and violence, and the system gives him the identity of a troll.
In order to continue to live, he must complete the ultimate task set by the system, which is to become the lord of the continent.
In the process of MC becoming a lord, he keeps challenging strong rivals while not forgetting to take beautiful and sexy elves into his harem.
SYSTEM: Congratulations to the host for turning on the function of having many children!
Troll: I need more territory and women.