Endangered Troublemaker Full Walkthrough and Details | Monster Hunter Stories 3 ( MHS3 )

The researcher is worried that the Astalos might go extinct, both because their numbers have remain stagnant, and because they have fierce tempers and don't get along with other monsters well.

Available after the [the Main Story Reunion (https://gmtreks.com/monster-hunter-stories-3/main-quest/23).

[1] Talk to the Worryward Field Researcher at Sunpetal Plains.

They're worried about the Astalos population since they havent's seen it increasing.

[2] Get the Ecosystem Rank of the Astalos to S.

First, make the Invasive Seregios retreat. Enter the endangered den and obtain the Astalos egg. Hatch the Astalos and release it in any habitat.

Afterwards, go egg hunting! In the area of the chosen habitat, Astalos eggs should start appearing in dens. Obtain those eggs and hatch them and release them into the chosen habitat to restore it and raise the Ecosystem Rank.

[3] Report back to the Worryward Field Researcher.

・Dragon Def Boost (S)
・Catalyst Key
・EXP x @5000
・Silver Trade Points x 1800