When you click Heroes List icon a panel will popup containing 5 Heroes. You can select all heroes or none, depending on what build are you making.
Some heroes cost less and others cost more, there are 5 tiers of heroes, usually meaning the more expensive the better.
In total, there are 61 Heroes and 15 Classes. Usually, each hero belongs to 2 classes, but there are some with 3 classes. Class bonuses activate when a certain amount of different heroes with same class are on the battlefield.
Classes are actually separated into Species and Classes. Usually the first is the species and the second is the classs. There is basically no difference between the two, only the God bonus can tell the difference, as it becomes inactive when a Species combo is active.
For example, the Orc class has 2 bonuses, first bonus applies +250 HP to all Orcs when there are at least 2 different Orc heroes on the battlefield. The second bonus applies +350 HP also to all Orcs when there are 4 different Orc heroes on the battlefield. These bonuses stack, so if you have 4 Orcs then they all get +600 HP. Some classes offer bonus to all allied heroes, not just for their class.
In addition to the Classes, each hero has an active ability or a passive ability. All the active abilities cost 100 mana and are triggered automatically when the hero reaches 100 mana. Heroes gain mana when they attack and they are attacked. Mana gained per attack is equal to 20% of the damage dealt capping at 10 mana points (before item enhancements).
But Mages, Shamans and Warlocks get double the amount per attack, capping at 20 mana points.
The star next to the hero's name shows the current rank. Every hero you buy starts off with 1 star, no matter how much gold it costs. You can combine 3 heroes of the same type with 1 star rank to make a better 2 star hero. And 3 heroes with 2 stars combine into a 3 star hero, that's the max.
The first icon on the left side of the heroes panel refreshes the list giving you another set of 5 heroes to choose from. The catch is it costs 2 gold. So be careful how many times you use it because you may run out of gold and still not get what you need.
The second icon allows you to lock the current 5 heroes in the list and prevents the auto re-roll when the round ends. This feature is the most useful at the start of the game when you get multiple heroes of the same type but don't have enough gold to buy them.
MAKE SURE TO UNLOCK IT after you got the needed heroes so you don't lose a free re-roll at the end of the round.
a) Courier Level - this determines the max amount of heroes you can place on the battlefield during a fight. But it also determines your chances of receiving better higher tier heroes. If you hover the chess buff icon you will see what your current chances are. Note, as this map was made by Chinese people, the translation is kinda weird, they call heroes 'chess' or 'chesses'. That's what 'chess' is referring to.
So here are the chances for each level:
b) 1st ability allows you to move heroes from the backline to the battlefield and to re-arrange them for a better strategic position.
c) 2nd ability allows you to move heroes to the backline. You can also do that with the first ability but this one is much faster.
d) 3rd ability - sells unwanted heroes. You will get equal to the Hero's level.
e) 4th ability does the same thing as the 'Refresh' button in the hero list.
f) You gain 1 XP point after each round. Additionally, the 5th ability allows you to exchange 5 Gold for 4 XP points. This is very important if you want to stay one step ahead of the your opponents.
This is how many XP points you need for each level and how much gold it costs if you want to trade Gold for XP:
a). At the end of every round you receive 5 gold. Except for the first 4 rounds when the gold gained is equal to the round number.
b). From interest, you get 10% flat of your current gold amount maxing at 5. So if you have between 10-19 Gold you get 1 extra, 20-29 => 2 and so on. So you really don't want to spend it all.
c). For every round win you get 1 gold.
d). You also get Gold for winning OR losing streaks, maxing out at 3. Here's the details:
• 3 win/lose streak you get 1 gold
• 4 win/lose streak you get 1 gold
• 5 win/lose streak you get 2 gold
• 6 win/lose streak you get 2 gold
• 7 win/lose streak you get 3 gold
If you are on a roll you can make 5 + 5 + 1 + 3 = 14 gold !!
Round 1: 2 melee radiant creeps
Round 2: 1 melee mega creep, 2 ranged creeps
Round 3: 2 melee mega creeps, 2 melee creeps and 2 ranged creeps
Round 10: 1 Stone Golem, 2 Mud Golems
Round 15: 1 Alpha Wolf, 4 Wolves
Round 20: 1 Red Hellbear, 1 Yellow Hellbear
Round 25: 1 Wildwing Ripper, 1 Wildwing
Round 30: 1 Ancient Thunderhide, 2 Ancient Rumblehides
Round 35: 1 Black Dragon
Round 40: 3 Dark Troll Summoners, 2 Dark Trolls
Round 45: 1 Yearbeast
Round 50: 1 Roshan
These creeps have a chance of dropping items, but the system is so weird that on Round 30 you could still get just a Stout Shield which is very disappointing. When it comes to items just use everything you have, don't wait around for some miracle Refresher or Rapier.