You can get "Millennial Wood" by winning battles against certain Mamono in the following event maps.

Area	List of the Mamono【Millennial Wood】
[Beg] Spot: Outside Tower	Treent
[Int] Spot: Outside Tower	Treent

You can get "Clacking Brick" by winning battles against certain Mamono in the following event maps or by mining in the map "Spot: B. Coalmine".

※You are able to check about Ice Axe and how to mine by clearing "Housing: Mining", which you can accept in main quest Ch.20.

Area	List of the Mamono【Clacking Brick】
[Beg] Spot: Outside Tower	Toppo Henchman
[Int] Spot: Outside Tower	Toppo Henchman
[Adv] Spot: B. Coalmine	Toppo Henchman
[Adv+] Spot: B. Coalmine	Toppo Henchman
[Hell] Spot: B. Coalmine	Toppo Henchman