Flash role in GH is to control.
ine of flash best things is that he can enter or escape a fight quick. Use this to kill enemies that tries to escape or to keep you alive colecting health tokens.
leveling the W makes flash able to deal several damage with basics attaks.
You can buy objets that can help you with this.
the game and stuff changed a little, so i upgraded my guide.
I'll start telling what mods i use
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Altered Blue Scarab - Charged Attack: Basic Attacks deal 10 + 20% Power Damage (Tier 3)
Enhanced Fatality's Energy Lance - +15 Power Damage (Tier 3)
Empowered Psi-Scimitar - Skilled Attack 2: After a skill use ,your next attack deals 50 + 50% Power Damage or 150% base Attack Damage (Tier 3)
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​So start with Cosmic Belt (2) for the 1250 gold u start with. It gives +125 Max health - + 25 Power Damage and Devastating 1: + 10 Power Penetration
and then i reach Fatality's Energy Lance (3)
that will give you + 65 Power Damage and + 10% Cooldown Reduction, so now you will do a lot of damage with your penetration
Flash's weak point is that he can't fight beacuse of his low health and armors and the fact that he's a Power Damage champion with plenty Cooldown on the skills, so just hit and run. Don't fight.
And remember to buy Radion Shard whenever you have 250 or 500 gold and can't buy anything that you want. when it reachs Tier 4 you can sell it back for the full value (1500) and then buy something pretty XD.