Here's how to kill Kongor at level 1 as Pyromancer, in 1 min 45 sec!
How to do this the fastest way:
Spawn as Hellbourne. Exactly when you spawn, press B-V-S-A-W-W-W-W, and use the Homecoming stone to teleport to the middle lane tower. While teleporting, put your skillpoint into Fevor (3rd skill).
Run to Kongor. Put an ward between the tree in the river and kongor's lair. Put one inside kongor's lair. Now pull him like this:
Keep Kongor close to you.
When you are up the hill, kongor will start running back. Position yourself like in the pictures, and start shooting. Do not move. Kongor will keep running into the lair, then back to you, without damaging or resetting.
When you are close to success, Kongor will have over 100 stack of Fevor, and will die quick.
Test this in practice first!