EDIT: Some links have been updated due to github repository change.

Overview

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There's not much to discuss for Fervor's base .txt and main lua. As a passive, Fervor does not require targetting filter and other important values, so the txt file is pretty much similar to Spell Shield. There is one difference, however, that it states "SpellDispellable" as no. This is optional, since it only affects the tooltip.
The ability file is also as simple as Spell Shield. A copy-paste, in fact, since the ability is not required to do anything other than spawning the modifier.

The actual actions happened at modifier instead, so let's focus on that one.

Modifier: Characteristics

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This modifier should appear at buff bar, hence we need to show it. Since it is not on the background anymore, its characteristics should be specified, such as:

• Is it hidden?
• Is it a debuff? (Otherwise is a buff)
• Is it can be purged?
• Is it removed on death?

So far, Spell Shiel…
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EDIT: Some links have been updated due to github repository change.

Ability Form Review

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Take a brief look on the ability's .txt file. It's quite short, since it's a simple ability.
Notice that the ability has been renamed as "antimage_spell_shield_lua" in order to avoid collision with the real one.
It is a basic ability with a passive behavior, and nothing else. No need for cast points, unit targetting, spell immunity, etc etc. It also has just one ability specials, which defines the magic resistance bonus on each level.
In short, it's short.

Introducing: Main Lua File

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Open up a text-editor, create new file and save it as "antimage_spell_shield_lua.lua", placed according to the .txt file. This will be the main script file, which defines what the ability does. Let's begin with the keypoints.

Class Identifier

You should generally want this particular line at the start of your lua files. This defines the start of a class for c…
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EDIT: Some notes has been edited due to github repository change.

Dota 2 Addon: Ability Lua Example

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Valve actually made their own tutorial on how to create custom abilities using lua. Well, "giving examples" is more accurate, but still it's very useful. The tutorial is an addon (custom game) named

"ability_lua_example"

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To play the addon, simply open Dota 2, then on your console (make sure you enabled it first), put:
Go with the flow (Lina recommended; she's hot), and voila: it looks like a hero demo! Go play with her and everything seems normal, except for the fact that she has 5 abilities.

Random guy: Okay, now what?

If you still didn't notice it, here's the hint: all of her abilities are written in Lua, and you may see (also edit) the script file(s).
The addon files are located on: …
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Okay, since this is my very first tutorial, there may be some mistakes. Just go along with me and ask some question, and we'll be fine. After a lot of considerations (mostly in sleeping, but still), I decided to take this one as the first tutorial.

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I'm pretty sure that you guys are already an expert in designing unique abilities and explain them to us, but how do you explain your abilities to Dota 2 engine?
You can tell the machine about your abilities by using a certain registration form. With this, there'll be more clarity for the machine about the description of your abilities, what they can do and what they cannot do.

Now the form, here you go.

Random Guy: Dafuq is that?

Relax, I'll explain them one by one. Just copy it to your editor, and save it as:
"<heroname>_<abilityname>.txt"
Where to? Anywhere, for now.

Hey, don't just read it. Copy and save it, get your hands dirty.

Now, here's the guide to fill the form. The form above has been filled with an abili…
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