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Start with jungling item *machete* increased dmg will be handy. You will start with unstable matter ability because it has % dmg on hp and very low cooldown you can spam it. Rest I showed up there.

Wolves->Blue->Red->mid gank->ghosts->golems->gank bot->recall->wolves->gank top-> etc..

I always start with blue because when you start with blue you will have to need both elastic slinghshot and streching strike abilities both so when you start from red instead of blue it wont change anything you will not be able to leve 3. when you start from blue it means it will spawn sooner than red and you can give the blue to mid earlier.

Use slingshot to jump on mobs at jungle than Q. you will get the small ones with 2 shots. smite the big ones and goon like this.

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I showed how I build my items I will explain it here why.

HP: I wont build lots of hp like 3.5 or 4k+ hp because you hit with %hp on you.. it is unnecessary damage to yourself at team fights instead I build magic resist and armor because your sustain will be incread also you will have almost 3k hp = less dmg to yourself more healing from passive and all.

Your essentials will be boots of mobility , rylai crystal scepter and spirit visage.

VISAGE: will be combined with your passive you will heal yourself 250 per slime at late game.
*I almost did not recall for I had low hp I just jumped to jungle and regained it like in 2 packs.

RYLAI: you are an Ap tank class you need ap and hp rylai ahs both :) thats not the whole reason ofc
When you use your ulti or any other ability it doesnt matter it has splash damage so in team fights there will be almost no enemy without slowed.

MOBILITY: you are a jungler you need speed especially for Zac because it can finish the jungle less min than any other jungler char. at level 3 it is faster than shaco's. you need mobility because you almost 2 shots every mob in jungle with slingshot and streching strike.(not the big ones)

SPIRIT OF THE SPECTRAL WRAITH: If you ask why you start with *spirit of the spectal wraith* and than sell it for *banshee's veil* because *sotsw* has regens = early game it really beneficial , it has smite cooldown = faster jungle you can spawn slingshot Q than smite the big ones, spell vamp = ekstra life with your passive not bad , % dmg to neutral mobs = again steeling dragon and jungling will be easy.

Than at late or mid game depends on your farm its' benefits will be ignorable and you can sell for ekstra money to complete another item or for last item only for banshee's veil.

YOUR LAST STATS WILL BE LIKE: 300 magic resist - 200 armor - almost 3k hp - 200+ap - 100+ad

I did not buy it with bundle I wont because It has only color change ah and the W skill has cooler effect like some kind like throwing multiple punches and it has worst thumb pic ever.