There 2 ways to hit all the 16 tiles of ice wall (if there’s more, please share)
Ice wall formation:
4 lines with 4 columns. Very simple and easy to draw. W = Ice wall tile, C = character
WWWW
WWWW
WWWW
WWWW
-----C-----
1. Using Fire Fox Shikigami atribute
To hit all the 16 tiles of ice wall, you will a very specific (and good) build: Cryo > Kino > Onmyoji
It has to be this build, since you will need ice wall (cryomancer), fire fox shikigami (onmyoji) and psychic pressure (psychokino).
1.1. Ice wall + psychic pressure
As you can see, I can hit only 8 tiles using the proposed formation of ice wall plus psychic pressure
1.2. Ice wall + firefox shikigami + psychic pressure
With Fire Fox Shikigami: Fire Property it’s possible to hit all the 16 tiles. You will need to invest only 1 point on this skill, just enough to buy the atribute.
2. Frieno set
This is very powerful way, because frieno set will provide the hits to ice wall, so you will be free to choose whatever class you want for your build. However, every magic has its price, frieno set will cost you a good amount of silver.
You can see frieno set being triggered and exploding ice wall in these two videos:
Hansol Jang: https://www.youtube.com/watch?v=qW9wJ-ihBTM
Bong TOS: https://www.youtube.com/watch?v=I7XuIzhDo7U
>> UPDATE 28/01/2019: It won’t be possible to produce ice wall fragments using Frieno Set effects after tomorrow’s maintenance (https://treeofsavior.com/page/news/view.php?n=1606)