Undying is melee STR hero who really good as a tank and good as a spellcaster and support. His ability can make enemy hero suffer to death. Undying is a good debuffer also a good healer for team. The only one bad thing in Undying is no disable skill.
With Decay ability, Undying can make enemy hero suffer, specially in early game. With this skill, Undying will steal enemy STR point in an area. Undying also claim the stolen STR for himself for a period of time. This skill can make enemy hero frustrated because losing STR means losing HP pool, right ?
His second skill is Soul Rip. When using this skill, Undying will damaging enemy target, but when you using it to teammates hero or yourself, you will heal them. This skill depends on how many target near you, more target mean more healing point or damage.
Tombstone is his third skill. Undying will summon a tombstone at the target point. Enemy who is in the tombstone area will be attacked by zombie. You can’t control the zombies. This zombies have a deathlust ability, which is causing their attack to slow enemy unit. Not only that, the zombies also gaining extra movement speed and attack speed when in deathlust form.
The ultimate skill of Undying is Flesh Golem. Undying will turn into a giant flesh golem that possesed plague aura. Enemy under effect of plague aura will take extra damage ! The closer to Undying, they will gain more damage and slow effect.