I have a world class attribute

being a dangerous assassin in his previous life who wouldn't hate him and be on his trail but somehow he was saved by the heaven and transmigrated to another world where magic exist and the strong prey on the weak , where the rich do what they liked and got away with it but one filled with monsters and different races A few hundred thousand years ago , strange things started appearing on earth and one of the major things noticable was the appearance of portals which were known as dougen gates and each leads to a place known as a dougen which is stocked with beast and monsters , the appearance of this dougen's ignited the curiosity of the humans who found a way to tap resources from it and at the same time neglecting the consequences [if they even knew of one] later the seals on some of the dougen's broke lose causing a large scale monster invasion which forced man to scamper for their safety. New races also began to appear in earth and their appearance on earth brought about a one sided relief as they help fight against the monsters but at the same time almost turned the humans to slave's , this was one thing the humans couldn't bear forcing them to find a way to find a way to harness what other races called mana awakening a special inborn talent inside of them. and now there's a system to assist, then a beautiful ice dragon empress then a beautiful and sexy succubus at his command before he could understand , a cunning fox added as his summon " I think life is getting more better" Rex said with a smile