So, I'm the dm for our next Dungeons and Dragons campaign and I'm making a ocean based campaign (I might be watching one piece right now which made me want to do a cool pirate sailing campaign.) but anyways, one of the people they might end up fighting is a necromancer. (I say might but realistically, its gonna happen.) And this npc has there knives with glyph of warding cast on the blades, with diffrent ones for different spells such as tasha's hideous laughter to make a target prone or level three magic missile to basically make ghost knives to stab them. But I'm worried that its unbalanced to go against level 5 players. I did add a homebrew rule where if you have a shield and are able to use it instead of adding +2 to ac you can use your reaction to block a melee attack if your saving throw (dex against a dex attack, strength against a strength attack. with disadvantage against sneak attacks and opportunity attacks.) if you roll higher you successfully block and do not take the damage. (If your opponent has a similar weapon to yours and is on this list. Longsword, shortsword and scimitar can parry attacks from the others, rapiers can parry rapiers, and the quarterstaff, the spear, the glaive, the halberd and the pika can all parry slicing attacks from themselves and as well as all swords besides the the greatsword.) Also, before you decide if the combat encounter is balanced for level 5, you should note that if they defeat someone with a homebrew ability, one member of the party can use that ability if they remove the spell scroll from either the boat or body of the previous user. (In this case any bladed weapon when used can have one glyph from the glyph of warding spell cast on it for a free action no spell slots, material components or distance before dispelled apply. then unusable till dawn.)
