[Unknown Mod][Locations][Sirens] Hero can exchange creatures of his choice and amount of creatures for experience points when he visits the Sirens

[LeHerosInconnu]

The hero can exchange the creatures of his choice and the amount of creatures for experience points when he visits the Sirens on the adventure map.
The hero can visit the Sirens to exchange creatures as many times as he wants.

When the hero moves onto the active square of the Sirens, the end of the displayed message is modified:

"You soon realize that you could trade some of your creatures for experience and pass it off as a charm that made them dive into the water where they drowned.

Would you like to enter?"

Instead of:

"Many of your crew fall under its spell, and dive into the water where they drown. You are now wiser for the visit, and gain 15000 experience."

The experience points sprite is no longer displayed, and the "OKAY" button is replaced by two buttons, "YES" and "NO".

In fheroes2:

When the hero decides to enter, a new window is displayed:

The left and right arrows on both sides of the creature sprite are displayed to allow to select the desired creatures present in the hero's army.
The "TRADE" button validates the trade without exiting the window.
The "EXIT" button closes the window when all trades have been completed.

When the "Game: Hero and Captain have extended inventory for artifacts" option is activated (#2995), creatures located in the extended inventory are also proposed for trade (to avoid the player needing to transfer them to the hero's standard inventory before visiting the Sirens).

Images are for explanation only.

This is an option:
"World: Hero can exchange creatures of his choice and amount of creatures for experience points when he visits the Sirens"

Note: all of this could eventually change.