In the following half month, Duke buried himself in the laboratory, focused on magic research.
Besides the materials exchanged from the Black Sail Treasure Vault, he also bought several related books to learn some theories and methods.
As half a month passed, the prototype of the magic was gradually perfected, and Duke named it Sand Guardian.
Sand Guardian is an automatic defense and counterattack system that can independently defend and counterattack once constructed successfully.
Even if Duke were in a coma, he could automatically summon yellow sand from the Yellow Sand Crystal to protect himself.
The most basic defense and counterattack do not require any consumption of magic power, but if one wants to enhance the strength, it requires infusion of magic power, which then consumes magic power.
Duke valued defense quite highly, so he constructed such a magic.
Many wizards also choose defensive magic, as having defensive capabilities without consuming magic power is crucial.
