Killing Roshan Early Game

If you have been playing dota, there is a unit call Roshan. It is the most powerful neutral creep with 9000 life and increases every 10 mins. Killing Roshan alone is very hard. Killing it early game is even harder.

I have played a game which they kill Roshan early game before the creep appear. They gain experince and gold too. After that, they just kill us easily. But how did they kill Roshan early game?

Even with 5 heroes it is no easy job to kill Roshan because any hero at level 1 has low armor, low hitpoints, low attack damage. However, there is 5 key points to kill it:-

1) Need a hero who can summon. The summon creature will act as tanker (Ex:- banehallow-summon wolf , syllabear-summon bear)

2) Slow Roshan attack (Ex:- Lich-his frost armor can slow enemy attack speed by -20%)

3) Healer (Ex:- omniknight, dazzle, necrolyte)

4) Reduce Roshan armor (shadow fiend, lanaya)

5) Increase team damage (vengeful spirit, luna, drow ranger)

Having all the 5 type of hero will easily kill Roshan early game. But do not let the enemy find out