This isn't my script, I forget who made it but I found on here a while ago
Even if you don't want to use the Spellbook Deed, it has full books already scripted as an item so all you have to do is add FullNecroSpellbook to the player's backpack
Note: It doesn't include Mysticism, I have added it to my own version of this script though.
And, if you're running a core expansion earlier than SE, you'll want to take a look at the code for FullNecroBook under FullSpellbooks
find this part:
[Constructable]
public FullNecroSpellbook() : this((ulong)0xFFFF)
{
this.Content = (ulong)0x1FFFF; //17 spells, includes Exorcism
//this.Content = (ulong)0xFFFF; // 16 spells
}
and change to this
[Constructable]
public FullNecroSpellbook() : this((ulong)0xFFFF)
{
//this.Content = (ulong)0x1FFFF; //17 spells, includes Exorcism
this.Content = (ulong)0xFFFF; // 16 spells
}