No city is more pious in its worship of Sol than Arasunia, and no man is more fervent among its zealous citizens than the Witch Slayer. Although he is viewed with uncertainty by the beast shamans and human sorcerers in the Legion, his combat prowess and holy powers make him a mighty ally. Wielding a musket and a bladed icon of Sol, he can not only hold his own in battle, but can also sap his enemy's strength and turn any ground into sacred territory.
Hero Role: Support/Ganker
I will be giving a guide that is more oriented towards support because that's the role that I believe he fits the best.
Skill List
Graveyard
Creates a Graveyard for 700 units in the target direction. Any enemies hit will fly into the air for 0.52 seconds and are stunned for 0.5 / 1 / 1.5 / 2 seconds when they land, taking 60 / 130 / 200 / 260 Magic Damage.
Type: Magic Range: 500 Radius: 150 Cast Time: .5 Seconds.
Cooldown: 12 Seconds Mana: 100 / 125 / 140 / 170
Action: Target Dual Position
Miniaturization
Applies Miniaturization to the target enemy for 1.25 / 2 / 2.75 / 3.5 seconds, settings its base Movement Speed to 100.
Type: Magic Range: 500 Cast Time: .9 Seconds.
Cooldown: 13 Seconds Mana: 110 / 140 / 170 / 200
Action: Target Entity
Miniaturization Effects: Perplexed, Silenced, Disarmed, Smaller!, Base Movement Speed set to 100.
Power Drain
Applies Power Drain to target for duration of the channel. The Witch Slayer gains mana equal to the mana drained. Instantly kills illusions.
Type: Magic Range: 600 / 650 / 700 / 750 Channeling Time: .9 Seconds.
Cooldown: 25 / 20 / 15 / 10 Seconds Mana: 10
Action: Target Entity
Power Drain Effects: 20 / 40 / 60 / 80 Mana drained per second.
Silver Bullet
Deals 500 / 650 / 850 Magic Damage to target.
Type: Magic Range: 700 Cast Time: .9 Seconds.
Cooldown: 12 Seconds Mana: 200 / 420 / 650
Action: Target Entity
Staff Effect: Increases damage from {500,650,850} to {600,800,1025}.
Item Build
Early Game
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Start off with either the courier or a pair of wards for your team. Your goal in the early game is to survive, set up kills, and allow your carry to farm.
Mid Game
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Continue to buy wards/counterwards to provide vision for your team if you are the ward bitch. If not, build up your farm and buy a Portal Key and roam. This will keep your enemies in fear of a 6 second disable and massive burst damage all the while allowing your carry to farm.
Late Game
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Your late game should be all about trying to get all of your spells off before dying. Obviously if possible avoid dying, but know that you are expendable. Be aware of which heroes you should CC and which heroes to burst down.