The story background of Warcraft alchemist, why does he ride a person on it, which seems exquisite?

The alchemist is a neutral and powerful hero in the customized map DotA adapted from warcraft 3: Frozen Throne, located in the evening pub. The alchemist DOTA is like an alchemist: Razzil Darkbrew, an alchemist, a rock singer and a goblin alchemist. As an elite of goblin alchemists, lazare was employed by the Guards to develop various chemical weapons against the natural disaster forces. When he went into battle himself, he experimented with a huge ogre as a mount. The chemicals used in those experiments are enough to turn an already difficult opponent, the ogre, into the most terrible monster. 5.2 Attributes when the growth factor is lower than 1 (version 6.67c): Life 625 alchemist magic 325 range 128 speed 290 strength 25+ 1.8 agility1+/.2 intelligence 25+/kloc-. 1.31+1%hit 0% stun 0% armor 0.6 alchemist Ellie (20 pieces) object resistance 3.5% spell resistance 25% dodge 0% he rode a giant ogre as a mount. ...