Spriter Help? and spawning question

how do you make it so that you can only use a boss summoning item at night?
And is there any spriters that can help me with an upcoming mod?

items in tConfig can have custom code , if you don't know about that look at the wiki.
for a specific code , there's a method called "CanUse" , which lets you decide if the item can be used or can-not be used.

Code:

public bool CanUse(Player P,int i)
{
      return !Main.dayTime;
}

Sure, just post a few things that needs doing. I have other projects though, so I won't be too dedicated.