How to counter Keeper of the Light in Dota 2

CHANNELED - Channels light energy, building power the longer it's channeled. Once released, a wave is sent forth that deals damage and gives vision in its path. The longer it is channeled, the more damage is dealt.

A blinding light flashes over the targeted area, knocking back units to the edge of the area and blinding them, causing them to miss some attacks. Minimum knockback distance is 175 range over 0.6 seconds.

Restores mana to the target unit and reduces cooldowns of all basic abilities currently on cooldown by a fixed amount. Is 30% more effective when used on himself.

Weakens an enemy's magical resistance, and applies a slow that increases in strength the more the target moves.

Summons Ignis Fatuus at the targeted area. Alternates on and off, drawing enemies closer with its mesmerising flicker.

Ezalor temporarily turns his body luminescent, gaining cast range, increasing the speed bonus from Bright Speed, and allows Illuminate to be channeled by a separate spirit and heal allies.

Release the channel early.

Keeper of the Light gains 1 movement speed for every 2.5 Intelligence. Whenever Keeper of the Light moves 300 distance, he leaves behind light that allows him to see 400 range for 3 seconds.