Purpose of this build:
This build is designed to be a versatile, playable leader that focuses mostly on defensive buffing, healing and funneling damage to the companion or a summon, while still packing some offensive punch. Summons serve a double purpose of increasing your damage soaking capabilities (which ultimately prevents damage to the party), while incidentally boosting your DPR in the process.
Damage funneling is accomplished in several ways. 1) The summons chosen provide lockdown capabilities, which set up the summon or companion as the only available target for a monster to attack, 2) Utility powers and your at-will are used to buff melee allies taking advantage of the wolf's aura with AC boosts, invisibility, and THP. Enemies can either attack buffed allies with reduced effectiveness, or attack the unbuffed companion and have damage wasted, and 3) the wolf's CA-granting aura should be enough to incite many enemies to attack it and get rid of the offensive buff, especially if you have allies that can do extra damage with CA (Rogues, Scouts, and Wild Shape Druids).
This build has a respectable amount of healing, especially from Paragon onward. It should be plenty for any party, especially given how much damage prevention is emphasized via buffs, THP, and most importantly the damage-soaking companion and summons. Save-granting ability is fair, with Knack for Success providing some respite in Heroic, and Clear the Chaff being your big-guns, mass save granter/buffer.
You don't actively grant many (if any) offensive buffs, but the wolf's aura is active as long as it's on the field, providing a solid, consistent boost for ally attacks. You also pack more personal offensive power than most leaders thanks to Combined Attack. Your typical nova round looks like this: Standard action: Combined Attack. Action Point: Tending Strike (you can only use Combined Attack 1/turn, despite having multiple uses of it). Instictive Action: whichever summon you have active. Basically, if you have a summon out and use an action point, you're making 4 attacks in a turn, which isn't too shabby at all.
Class: Druid (Sentinel)
Paragon Path: Spiral Wind's Ally
I chose Half-Elf because the new racial power offers some leader functionality that otherwise isn't available to low-level Sentinels. Dwarf is also a superb choice, as your companion regains a surge's worth of HP for free when you second wind, which the Dwarf can do as a minor action. The Paragon Path is currently the best option for improving the leadership capabilities of a Druid, offering plenty of additional healing. Spring was chosen because the Wolf's aura provides a good counterbalance to the otherwise highly defensive nature of this build. Obviously the Bear works well for a purely defensive build, but I prefer a more balanced approach. All leaders should contribute to offense in some way.
Str-11, Con-21, Dex-14, Int-12, Wis-21, Cha-9
Con and Wis were bumped at each opportunity. Alternatively, you can switch Dex and Int around which reduces your Initiative, but you can qualify for Blade Initiate (Swordmage M/C) which allows you to use heavy and light blades as an implement. Doing so frees up your weapon enchantment for something other than an Alfsair Spear.
Hit Points / Bloodied: 93/46 (12 base + 21 Con + 50 level + 10 Toughness)
Healing Surges: 14 (7 base + 5 Con +2 Durable)
Healing Surge Value: 28 (1/4 HP + 4 Swift Recover +1 Belt of Vigor)
Since you want your animal companion and summons to soak as much damage as possible, you want to make sure that you have enough HP and surges to take that punishment. More importantly, you want your surge value to be as high as possible. This is because when you re-summon your companion after it's been reduced to 0 HP, it comes back with HP equal to your healing surge value. It also gets free HP equal to your healing surge value when you use your second wind, so the higher your surge value the more damage your companion can soak.
AC: 27 (10 base +5 level +5 Con +2 enh +3 Hide +1 shield +1 feat)
Fortitude: 24 (10 base +5 level +5 Con +2 class +2 enh)
Reflex: 20 (10 base +5 level +2 Dex +2 enh +1 shield)
Will: 22 (10 base +5 level +5 Wis +2 enh)
Initiative: +7 (+5 level +2 Dex)
This build is primarily focused on defensive buffing, so Tending Strike is a natural choice. It's best to buff up melee allies that focus on enemies within your wolf's aura; this way enemies must choose to either attack a buffed PC, or the damage-soaking companion. Either way you're doing your job.
Combined Attack x3
Combined Attack can't be traded out, so you might as well make the most of it. Focus fire on an enemy that a Summon will use its Instinctive Action on for impressive burst damage for a leader. It'll be your go-to attack when Tending Strike's THP aren't needed. It's also useful for shuffling around your companion's position (Move action: you move adjacent to an enemy, companion shifts. Standard Action: Combined Attack allows companion to move its speed as a free action, and you both attack target).
1: Summon Pack Wolf
5: Life Blood Harvest
9: Summon Crocodile
The Pack Wolf synergizes extremely well with the Wolf companion, resulting in enemies being locked down (via the Pack Wolf's prone and companion's OA) next to a summon and a companion, both of which you want to funnel attacks onto. The Crocodile works much the same way, only by directly grabbing an enemy and holding it in place (make sure that place is in your Wolf's aura). Life Blood Harvest gives you a nice emergency heal for when your Healing Words and buffing/damage funneling just won't cut it.
Variant 1: Destructive Harvest makes a good alternative to Life Blood Harvest if you find that you don't need the healing all that much (especially true if there's another leader in the party). It's great against solos and elites, as it provides a nice damage buff to allies adjacent to the target. Works particularly well if you have a lot of melee multi-attackers in your party (Rangers, Monks, and Whirling Barbarians).
Variant 2: This is another variant on your level 5 selection. If you want to go with a full summoning theme, and if your party can coordinate to keep enemies from running away, Summon Shadow Ape simultaneously brings a defensive buff, a DPR boost, and damage funneling to the table.
6: Camouflage Cloak
10: Clear the Chaff
F: Swift Recovery (heal)
Barkskin and Camouflage Cloak both provide excellent defense buffs to allies with a minor action. They can both help you funnel damage onto a summon or your companion if you use them on melee allies that are taking advantage of the wolf's aura. Once again, enemies must choose between attacking buffed allies or the annoying wolf that's providing CA. Clear the Chaff is a phenomenal save granter, which by this level is probably going to get plenty of use. Prior to this Knack for Success was the only way you could grant saves.
Variant: If you prefer to have more offensive buffing power, choose Guided Shot (perception) for your skill power, which turns an ally's missed attack against AC into an attack vs Reflex (which will likely hit, if it didn't miss by much initially).
R: Knack for Success
U: Restore Life
Knack for Success is the major reason why Half Elf was chosen for this build. Because Sentinels get Combined Attack forced on them, they have fewer leader options during combat that other leader classes.
1: Melee Training (Wis)
2: Versatile Expertise (spear weapon, spear implement)
4: Swift Recovery
6: Skill Power
11: Armor Specialization (Hide)
Other feats that work well for this build are Improved Defenses, Superior Will, Strong Willed Summoning in late Heroic or early Paragon, and Battlewise if you prefer getting your wolf into position before your allies take their first turn (however, since you don't specialize in offensive buffing or de-buffing, you don't really need to go first as much as some of the more aggressive leaders or your controller counterparts). Blade Initiate is an option if you want to wield something other than an Alfsair Spear, and if you want to focus more on off-striking with Combined Attack then damage boosting feats like Weapon Focus, TWF, etc are useful. Check out Initiate of the Faith (Cleric M/C) if you want an extra Daily heal, though you may want to train it out once the build's healing capabilities start to pick up.
Main-Hand: Alfsair Spear +2 with Siberys Shard of the Mage +1
Off-Hand: Light Shield
Armor: Lifeblood Armor +2
Neck: Healer's Brooch +2
Arms: Iron Armbands of Power
Waist: Belt of Vigor
Companion: Friend's Gift
Lifeblood Armor makes sure that you're buffed with THP at the start of every encounter. You'll need the Alfsair Spear to use both Weapon and Implement attacks. You'll definitely want to use implement attacks, as Summons are much better than most of the weapon-based dailies. The Shard and Iron Armbands keep your damage up to par since Combined Attack pretty much forces you to be an off-striker. Belt of Vigor boosts your surge value, and the Friend's Gift gives your Animal Companion extra HP when you spend a healing surge to have it re-gain HP. This definitely works when you second wind, though it's unclear whether it works when you re-summon. "Doing so causes your animal companion to appear in the nearest unoccupied space, with hit points equal to your healing surge value." IMO it works fine since the companion goes from 0 HP to surge value HP as a direct result of you spending a minor action and a healing surge, but the wording is a little ambiguous.