OK so i got this not long ago, took about 20 maybe 30 kills at the most.
You will see some comments saying "kill the frog in this corner and he will eventually spawn bla bla" if you go to mapfiend and download and install the latest map's. You will see on the map 5 frog traps , and the 2nd trop, or 4th trap "depending witch way you look at it" it will say his name there, the warlord.
Now for the main thing you need to know . Acctivate each trap, pull the frog and kill. you will commonly see "A young frog" those are just wastes.. Now keep doing the traps until you see a A Korascian Hunter . or of course. the warlord.
that is the trap where the warlord will spawn. The trap the warlord will be on will always spawn either a Hunter Or Him. So can just camp on that trap area. Or just kill the other traps as you go.
The Warlord trap switches sometimes. Dunno how or when, but i seen it in 3 different places of my time killing.

Ball of Golem Clay
Blue Diamond
Brick of Immaculate Steel
Cloak of Earthen Twine
Diamond
Glyphed Rune Word
Peridot
Spectral Parchment