Elder Titan

Make sure to keep nearby camps unblocked as you want Astral Spirit to pass through neutral creeps.

Keep creep equilibrium close to your tower to have more distance to run the enemies down under Astral Spirit buff.

Natural Order around Astral Spirit reduces magic resistance while around the hero there's armor reduction.

When there's no Astral Spirit out, both Natural Order's magical and armor reduction applies around your hero.

Astral Spirits movement speed is equal to your heros at Astral Spirit cast, e.g. pop Boots of Bearing or Phase Boots before casting.

When opponents clump up, cast Astral Spirit and channel Echo Stomp followed by Earth Splitter.

Once you get hold of Aghanims Scepter, you can enter the fights and right click more easily with debuff immunity.

Avoid being hit by Elder Titan's Astral Spirit and consider blocking a pull camp.

Avoid trading with Elder Titan when the Astral Spirit returns to him.

Avoid fighting in choke spots and clumping up against Echo Stomp into Earth Splitter combo.

Buy armor items, magic barrier giving items and Black King Bar against Elder Titan's Natural Order.

Astral Spirit buff on Elder Titan can be dispelled so items and spells that dispel Elder Titan are good.