Translated automatically from Italian: talent and ability names stay in English, as in the game. Original text (Italian) →
This build levels your Druid by shifting form to suit the enemy: Cat when you face just one, Bear when they come in packs or when a dungeon needs a tank. Between fights you heal yourself and move on without breaks. It is built for the trees redesigned on October 30: no Berserk, and from 40 Primal Bite and Shifting Power come in.
How to play it
Why pick it
With this build you don't choose once and for all between damage and toughness: you stay in Cat while enemies come one at a time and turn into a Bear when things get complicated. The slowest stretch is the start, because Bear comes at 10 and Cat only at 20; then the pace changes, with Prowl taking you behind your target and heals replacing almost all the breaks to drink.
Talent milestones
10-14: all five points in Ferocity, which lowers the cost of Maul, Claw, Rake and Swipe: until 20 it is the only talent you feel.
15-19: Feral Instinct and Feral Swiftness, meaning a stronger Swipe, a Prowl that is harder to spot, a faster Cat and a bit of dodge; from 20 they help both Cat and Bear.
20-24: Feral Charge, Savage Fury and Sharpened Claws, together with Cat Form.
25-34: Lacerate (in Forever you get it from a talent), then Blood Frenzy, which on crits gives Rage to the Bear and an extra combo point to the Cat, then Predatory Discipline, the gateway to Shifting Power, Predatory Strikes, Leader of the Pack and Natural Instinct.
35-39: Rend and Tear, which rewards bleeding targets with more melee damage; together with Predatory Strikes it carries your passive damage.
40-41: the last row, Primal Bite and Shifting Power, while you learn Dire Bear Form: the sharpest power jump of the path.
42-60: the remaining 19 points go into passives in Restoration and Balance: Heart of the Wild (Strength in Cat, Stamina in Bear), Naturalist (+10% to all damage), Genesis (stronger bleeds), Nature's Reach and Nature's Majesty (hit and crit).
Cat, one enemy at a time
Enter Prowl, get behind the target and open with Ravage, or with Shred until you have learned it. Keep Rake up at all times and build combo points with Shred from behind, with Claw from the front. At 4 or more points use Rip if the enemy still has plenty of health, Ferocious Bite if it is about to drop. When Energy falls below 50 press Shifting Power, without draining the Mana for your heals, though.
Bear, when there are many
Enrage before you engage, then Faerie Fire and Primal Bite whenever it is ready. Against a single target fill with Lacerate, against many with Swipe; Demoralizing Roar and Thorns do the rest. Maul only serves to dump extra Rage, because it replaces a normal attack that would give you Rage.
What to look for in gear
Weapon DPS comes first, not its speed. Behind the weapon come hit and Expertise, then crit and Agility, and only after that Strength and Attack Power. Stamina gains value when you tank.
Strengths
You move a lot: Cat Form runs fast, Travel Form arrives at 30 and Feral Charge closes the distance.
Damage or tank as you like, just by changing form.
Heals spare you many breaks, and Prowl lets you avoid pointless enemies and always strike from behind.
In Forever you don't have to leave your form to drink a potion, eat, open a chest, use a quest item or talk to an NPC; gathering, fishing and a few items are the exceptions.
Weaknesses
Up to 20 leveling is slow, because Bear comes at 10 and Cat only at 20.
In Cat Form you have no real AoE damage: at most you spread Rake across several enemies.
On single targets you kill more slowly than the fastest leveling specs.
It is meant for leveling: for level 60 dungeons and raids you need a different build.
Notes
The Aquatic Form quest unlocks at 16: don't put it off.
Keep Mark of the Wild and Thorns up at all times and, between enemies, heal with Regrowth, Rejuvenation or Healing Touch instead of stopping to drink.
In Forever's dungeons mobs give little experience: only go in with their quests already in your pocket.
For extra experience use cooked food with an experience bonus, rested experience and the Cozy Sleeping Bag quest chain.
Professions: Skinning and Leatherworking, which soon give you a crafted hood and shoulders and the Camp Tent, with which you build up rested experience. If you prefer potions, pick Herbalism and Alchemy instead.
Recommended races: Night Elf in the Alliance; Tauren or Windshaper Skyborne in the Horde.