Tips to Use Keeper Of The Light (Dota2)

• Illuminate clears fog of war while channeling and as such should be used liberally when in dangerous territory to prevent a sneak attack by the enemy. Remember that charging it to fulmination increases its sight range; charging it and releasing it immediately will not be good for gaining sight.

• Illuminate's notorious creep-killing power makes Ezalor a remarkably good farmer considering his supportive role. As such, he will always have money for wards, and should ward extensively; as vision of the enemy allows for powerful Illuminate strikes.

• Although Illuminate is extremely powerful for early-game pushing and harassment, it will disrupt the farm of your laning partner; so if used it should be positioned only to damage the enemy heroes. Owing to his ability to replenish his mana, Illuminate can be used constantly; but mana replenishment is generally better used on his laning partner.

• Using Mana Leak and then Illuminate on a foe will force them either to take damage or lose mana; depending on whether or not they choose to move.

• Remember that you are a support. While maxing Illuminate seems a good choice for the damage and the pushing potential, it will also make you an easy prey to ganks. Unless you wish to push hard really early, consider maxing Chakra Magic first, which is very useful in the early stages of the game. If you are soloing a lane, a viable option for Ezalor; Illuminate can be maxed first and used to scare the enemy heroes into losing their lane.

• Keeper of the Light is a very effective lane support for Heroes who are very mana dependent; Chaos Knight, Morphling, Juggernaut, Skeleton King, Magnus, Tiny, Zeus, Leshrac, Ancient Apparition and many other Heroes will have their lane sustainability greatly augmented by your presence.

• Mana Leak will instantly stun Lone Druid's bear, as he has no mana by default. Use this to save yourself o

source: http://dota2.gamepedia.com/Keeper_of_the_Light