I made artifact that restores health. Did it all in OnTickInGame. But when I remove the effect remains.

 

Code in OnTickInGame:

 

	if(mc.thePlayer.inventory.getStackInSlot(6 - 6) != null && mc.thePlayer.inventory.getStackInSlot(6 - 6).itemID == Items.artSoul.itemID )
	{
		mc.thePlayer.addPotionEffect(new PotionEffect(Potion.regeneration.id, 100, 0, true));

	}

When you remove what the effect remains? The code? The item?

Wouldn't this add 100 ticks to the potion duration on every single tick? Thus making the effect last 100 times longer than however you had it equipped for? You should try having it check to see if the potion effect is already active before applying it again. Here's the code I used for one of my items:

 

if (!player.isPotionActive(Potion.jump))
        	 {
        	  player.addPotionEffect(new PotionEffect(Potion.jump.id, 500, 1));
        	 }

Thanks all! For the help!