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Bash
Gives a 25% chance for melee heroes, and 10% chance for ranged heroes to bash on attack
Stuns for 1.4 seconds
Has a 2 second cooldown
Does not function with other Cranium Bashers, Abyssal Blades, Troll Warlord's Bash, Slithereen Guard's Bash, Faceless Void's Time Lock or Spiritbreaker's Greater Bash

Overwhelm
Disables a target unit for 2 seconds.
Can be cast on magic immune units.
Costs 150 mana, has a 60 seconds cooldown, and a 140 cast range

Drops from Roshan

Reincarnation
Brings you to life with full health and mana 5 seconds after you die, at the location where you died
Aegis of the Immortal is removed from your inventory after reincarnating you once
Aegis of the Immortal is also removed from your inventory when Roshan respawns (10 minutes after he was killed)

Can be disassembled

Ultimate Upgrade
Upgrades the ultimate of certain heroes when acquired, details can be found on the appropriate hero page

Only affects Beastmaster, Earthshaker, Pandaren Brewmaster, Stone Giant, Clockwerk Goblin, Sacred Warrior, Axe, Doom Bringer, Lord of Avernus, Night Stalker, Butcher, Undying, Spiritbreaker, Sand King, Juggernaut, Moon Rider, Gyrocopter, Vengeful Spirit, Venomancer, Netherdrake, Geomancer, Lightning Revenant, Faceless Void, Crystal Maiden, Enchantress, Faerie Dragon, Holy Knight, Lord of Olympus, Prophet, Slayer, Windrunner, Goblin Techies, Twin Head Dragon, Shadow Shaman, Bane Elemental, Dark Seer, Demon Witch, Lich, Necrolyte, Oblivion, Obsidian Destroyer, Queen of Pain, Warlock, Shadow Priest, Invoker, Necro'lic, Tormented Soul, Witch Doctor

Comes with 4 charges.
The charges can be replenished by buying the recipe again.

Endurance Aura
+5 attack speed
+5% movement speed
900 AoE

Endurance
Gives +10 attack speed and +10% movement speed during 6 seconds to all allied player-controlled units in a 900 AoE
Has a 30 second cooldown

Stacks with itself in inventory
3 charges

Eat Tree
Eats a tree to restore 115 HP over 16 seconds
Purge will end the effect even though the status icon will remain

1 charge

Summon Animal Courier
Summons an Animal Courier to carry items for you
Animal Courier is not affected by most spells
Items an Animal Courier is carrying will drop to the ground if it dies
Costs 5 mana
Full stats for the Animal Courier can be found at the Unit Statistics page

Movement speed bonus does not stack with other boots (Boots of Speed, Power Treads, Boots of Travel, Arcane Boots, Phase Boots, Tranquil Boots)

Replenish Mana
Restores 135 Mana to allies in 600 AoE
Costs 25 Mana
Does not work on Meepo clones
Has a 45 second cooldown

Can only carry one

Unholy Strength
Gives +31 damage, +10 attack speed, and +25 Strength while active, but drains 37 HP per second which can't be reduced.
Activating has a 5 second cooldown
You cannot die from the 37 HP loss per second, nor from the health loss when deactivating

Positive Armor Aura
+5 armor
Does not stack with armor auras from Assault Cuirass, Ring of Basilius, or Vladmir's Offering
900 AoE

Negative Armor Aura
-5 armor
900 AoE

Attack Speed Aura
+20 attack speed
900 AoE

Cleave
35% Cleave on attack
225 AoE
Cleave does not work on ranged units

Buyable from Goblin Merchant

Avatar
Gives magic immunity
Duration and cooldown decrease each time it is used
Duration is 10/9/8/7/6/5 seconds, and cooldown is 80/75/70/65/60/55 seconds. After 5 uses it stays at 5 second duration and 55 second cooldown

Damage Return
Returns any damage you take (after reductions) to the unit that dealt the damage (you still take the damage as well)
Damage is returned as pure damage
Lasts 4 seconds, costs 25 mana, and has a 22 second cooldown
Does not return damage that was caused by another Blademail

Buyable from Goblin Merchant