It will summon a aggressive monster based on your saved monster ID, and it will fight for and with you.
Level 1 - Summons a monster to fight for you for 3 minutes, and costs 1 soul.
Level 2 - Summons a monster to fight for you for 5 minutes, and costs 2 souls.
Level 3 - Summons a monster to fight for you for 10 minutes, and costs 3 souls.
If you have Soul Mastery level 10 level 1 and 2 costs no souls, but level 3 will always cost 3 souls.
Materialized Souls now fully inherits the players stats * 2.
Str, Agi, Int, Dex, Vit, Luk
Basic Attack, MATK min & MATK max
Weapon Atk, Weapon Atk2