If you plan to reroll into Tornado Shot when you're filthy rich, just league start it instead

Note: Storm rain's dps was miscalculated in PoB, the new single target skill is Artillery ballista Leveling: Act 1: Copy and paste the text just below in the vendor window to highlight socket links, movement speed boots and flat added damage on a bow g-g-r|g-[gr]-g|r-g-g|nne|rint|Heat|roste|Humm Try to socket your main skill and ballista setup in your helmet, body armour or gloves, so that you can upgrade your bow and boots without worrying about the sockets on them. Kill normal enemies with your main skill to gain onslaught or replenish quicksilver flask charges Drop your Ballistae on tanky enemies Ignore rare monsters Place War banner on bosses to gain adrenaline (good burst of damage) Make sure Blink Arrow and your main skill have "attack without moving" enabled. Keep identifying rare items, equip them if they are upgrades (life, resist, flat elemental damage, attack speed, accuracy) otherwise vendor them. Act 2: Do the Great White Beast quest for a Quicksilver flask, use Alteration orbs on it until it rolls either increased effect or increased movement speed during flask effect. Act 3: From here, if your damage ever feels bad, go buy some uniques from the leveling item sets. Prioritize prismweave and karui ward. If you're too poor, start farming the league mechanic every zone until you can afford them. Keep an eye out for 4L, the colors you want are Green Green Blue Red for both of your skill setups. If you find a 4L on a base that has evasion but not the colors you need, use chromatic orbs on it. Level 75+ You can path your tree to inveterate / entrench to be have 100% spell suppress, juggle these according to how much spell suppres you have on your gear. To get rampage on the build, you can Weapon swap to a Sinvicta's Mettle. The trick is to fire your attack from far away, and weapon swap before it kills enemies, it takes a bit of practice at first but it's definitely worth it. The transisition From Rain of Arrow to Tornado Shot: As soon as you finish uber lab and have piercing shot allocated on your tree, you can gem swap Rain of Arrow + Added Cold to Tornado Shot + Greater Multiple Projectiles