Lone Druid

Sylla the Lone Druid is an adaptable and versatile ranged or melee agility Hero, who summons a Spirit Bear, who has a set of skills and can equip items, as his ally. With the help of his Spirit Bear, he can carry, jungle, and push lanes effectively. Because of these, technically speaking, the Spirit Bear and Lone Druid himself, are two available heroes at once. The Lone Druid himself is mostly played as the aura giver, while the Spirit Bear is played as the main damage dealer and tank. When he activates his abilities, it will not only buff him but the Spirit Bear as well. Lone Druid is versatile as he can change from a fast ranged warrior to a tough and mighty melee bear himself. Together, they can push the lanes effectively, farm Neutrals in a cinch, and can take down Roshan by themselves if equipped with the right items. Due to the Spirit Bear, Lone Druid can have up to 12 items making him extremely formidable as he scales into the late game.

Spirit Bear
Spells last as long on Spirit Bear as they do on heroes.

Spirit bear can gain mana pool by gaining an item which directly grants mana. Using Soul Ring gives Spirit Bear a mana pool for its duration.

Tips

 * Due to the bear's very high health, he can be used to tank neutrals and jungle early game, or provide good lane control with harassment and last hitting, with very little risk of dying.
 * With two or more levels of Synergy, Rabid can be continually used, since the cooldown does not exceed the duration.

Various mechanics
Mana
 * Unlike Animal Courier and Flying Courier, Spirit Bear can obtain mana from items directly increasing mana pool.
 * Natively Spirit Bear seems to have a bit less than 0.1 mana regeneration, modifiable by % mana regeneration items and direct mana boosts.

Items cooldowns
 * Sylla and Spirit Bear cannot pass items to each other to avoid or bypass an activatable item's cooldown.
 * In other words, once an item is activated, the cooldown does not change upon moving the item to the other inventory.
 * You also cannot use an item that would normally share cooldown with identical items (such as town portal scroll) on Sylla, then pass a second copy of that item from the bear. The second copy will show the same cooldown as the first once it enters Sylla's inventory.

Hand of Midas
 * Unlike Dota 1, Spirit Bear can use Hand of Midas, however Sylla will not gain the 2.5x experience for creeps killed by the bear's use of the item.

Gem of True Sight
 * Gem of True Sight does not reveal invisible units when held by Spirit Bear.
 * Spirit Bear still drops it on death.

Aegis of the Immortal
 * Spirit Bear cannot pick up Aegis of the Immortal, but can attack (destroy) it.

Runes
 * Spirit Bear can destroy runes, as can any other unit. Spirit Bear can only use invis, haste, and regeneration runes. If the bear attempts to pick up an illusion or double damage rune, the rune is destroyed.
 * Spirit Bear can bottle runes normally but does only gains the rune effect from using a bottled invis, haste or regeneration rune. Spirit Bear cannot use normal bottle charges.
 * If Spirit Bear uses a bottled Double Damage rune or a normal Double Damage Rune while within 450 units of Lone Druid, Lone Druid will gain the Double Damage effect.

Skull Basher
 * Spirit Bear can carry a Skull Basher that works independently from any carried by Lone Druid himself.

Trivia

 * Lone Druid's original name was "Syllabear", a pun on the name of Syl-lab-le, one of the developers who worked with Guinsoo. Before retiring, he created this hero. It has now been shortened to "Sylla".
 * Lone Druid, while on True Form, used to have a second sub-skill called One, it equally distributes the damage taken by Sylla and the Spirit Bear, allowing them to endure more damage and live longer.
 * Lone Druid is so far the only hero who can purchase two Skull Bashers as his Spirit Bear can carry one while he himself would carry the other without the cooldown of the Bashers interfering with each other.