Responses

he's an assassin type character... im pretty sure the skills you mentioned are for mage characters. Sure, those skills are pretty op aoe-wise, but sucks ass for single target and are so mana intensive. MC can even barely keep up with his shadows's mana usage. Also, he often fight solo anyways and mage characters are great only in parties with a tank. Thus, his current skill are the only skills he needs for solo leveling ╮( ̄▽ ̄)╭
This MC sucks at efficient grinding. Heck, throw an bomb into the demons and git gud pleb!