The Death Mage Volume 2: Light Novel - Densuke - Bog

Vandal has become the hero of the Ghoul Grotto after using his vast magical power and death magic to defeat the Kobolt King. He remains with the ghouls, learning non-attribute magic from Zadilis, and spending some peaceful time with his allies while helping with such issues as the mage's old age and declining birth rates in the community. However, there is a growing threat from an orc army led by the noble Orc Bugogan, who is intent on wiping out the ghouls--or worse!