HIVE

It's quite easy. There's an event that detects when a building has just been built. Then, in conditions block you check if it's a certain unit-type (your buiilding), and at last, you give the ability to it.

Here's a simple example that I just made, and I wrote some notes there: https://www.hiveworkshop.com/pastebin/edeb2b44106a78cca1a6b114c276f17111685/

It works at the top!
You always solve my problems, thanks

Another question: I create personalized objects, one based on the construction of the watchtower in Humans. By setting the cost in gold and wood, it changes these parameters to PURCHASE.
When I want to build the building using the object, there is still a cost. But I do not know where to go to change that cost in gold and wood.

No problem, man. I'm glad I could help you!

About the cost: are there 2 objects? One of them is a normal unit who builds and the other object is based on a tower?

There are two elements: a unit (the tower) and an object (allowing the construction of the tower).

The object is in the building of purchase.
To buy it, it is necessary to use gold and wood.

Once bought, by clicking on the object, it creates the tower in question and it still requires gold and wood, and even mana! I do not understand why.

For the info, the object is endowed with a skill "construction of a tower" and on this skill appears the created unit (the tower).

I tried to reproduce that, but everything worked fine for me. I made a custom tower, a custom arcane vault (item seller), an item (based on tiny barracks), and a modified ''build tiny barracks'' ability. By default, the build tiny barracks doesn't require mana, so its field is set to 0. If you hover the mouse on the item, it shows the amount of gold and lumber you will receive for selling it back to the shop.

If that's not how it's working for you map, could you send a demo map with it, so I could reproduce it properly? Thanks.

The map on which I work or a light map with only this?

I found the problem on mana
I also noticed that for an object with several charges, the price of each load of gold and wood decreases with the amount of charge.
Example: a three-charge object
First load -> 220 gold, 60 wood
Second load -> 100 gold, 37 wood
Third load -> 84 gold, 13 wood
I invented the values

I think I understood
An item that requires 200 gold and 200 wood to buy it will require half to be built: 100 gold and 100 wood.

That's right: for an object initially costing 250 gold, and having 5 charges
Charge 1: 125 gold
Charge 2: 100 gold
Charge 3: 75 gold
Charge 4: 50 gold
Charge 5: 25 gold

It is therefore not modifiable, but by default half for the first charge then a regular decrease

That's odd, it should set its sell price to half of base price multiplied by the amount of current charges. You can also change the item sell percentage, going to Advanced -> Gameplay Constants... -> Inventory - Sell Item Return Rate (almost in the end of the page).

It's fine, thank you

Another challenge: I tried to redo the fate of Marshmalo in "Siege of Quel'thalas 4.5". In the map, it is possible to buy as object of 'Runes of shock". I can not do the same thing as he does. Do you think you can help me with this? Thanks in advance

It looks like a goblin land mine based spell. I made it for you, though I'm not sure if it's 100% accurate:
https://www.hiveworkshop.com/pastebin/ba840fe987147108cf7ea4bb53ce619111694/

Thanks again and again

I tested several times, the aura (slow) does not always work
Moreover, when a unit passes on the rune, there is no explosion animation
I tried to do this by trigger starting with Rune Trap
Three special effects appear to be used:
Objets\Spawnmodels\NightElf\NEDeathMedium\NEDeath.mdl
Abilities\Spells\Human\DispelMagic\DispelMagicTarget.mdl
Abilities\Spells\Orc\WarStomp\WarStompCaster.mdl
But it is not really that: Abilities\Spells\Orc\WarStomp\WarStompCaster.mdl gives a red effect, whereas in the map it is in blue that it appears
Maybe it's another trigger that changes the color of the special effect pattern
I don't know….

All right, I'll check it out.

May I add you on skype again? I had you there, but for some reason it shows an "?" icon next to your name, and I can't talk to you.