Charge. If the yuan-ti dragoon moves at least 30 feet straight toward a target and then hits it with a glaive attack on the same turn, the target takes an extra 10 (3d6) slashing damage.   Magic Resistance. The yuan-ti has advantage on saving throws against spells and other magical effects.   Petrifying Curse. At the beginning of his turn, Zachan the First rolls a 1d6. If the roll is 1, Zachan is petrified until the end of his next turn. While petrified, Zachan is unable to move, perform any actions or any reactions. Additionally, Zachan is immune to any other damage types except Acid, Force and damage from adamantine weapons.   Glaive of Malignant Blood. If upon rolling the damage for his glaive attack Zachan rolls with any single die a roll over 9, the glaive's special ability activates. From the wound erupts a sanguine serpent head, immediatedly biting at a random creature other than Zachan within 5ft of the host, or at the host themselves. The attack has +5 to hit and deals 1 piercing damage plus 2d4 poison damage. If the target succeeds at a DC 12 saving throw, the poison damage is halved. After attacking, the serpent head withers away.