EspectroW

try this:

1) create a player variable called "Bank_on" type Boolean


 
2) create the npc to talk, with dialogue and set de player variable to true
 

 
3) create the NPC BANK and set the conditional, player variable is equal to true.
 

 
with this method, if the player don't talk with the first NPC, the BANK NPC will show "you can't" so, the player need to talk with the first NPC to activate de variable to true.

A piece of advice, don't look here for someone to do something for you. You will not find someone willing to offer sincere help. Create your game, with the tools you have, with the knowledge you have, little by little you will learn more. When you think your game has enough to start sharing it, believe me, if you like it, there will be other people who will like it. create your community. I can assure you with my own experience, that help will come by itself. If you seek help in this medium, you will only get ridicule and they will make you feel that what you are doing is not good. when it can be something beautiful.
 
Good luck in your project and I hope you can develop everything you propose.

this will healy 300 hp per second during 5 seconds
 
If you want a single heal when using the skill, set the duration to 0 and uncheck HOT/DOT
 
It is also important to set the damage type to true. so that it does not scale with the character's damage or be affected by defenses

You can modify the character's statistics by creating a Spell, and in the item you do not select it as a consumable, select it as a spell. and link it to the Spell that will fulfill the function of "potion"
 
 
Spell:

 
 
Item: