Throw trial and error you have learnt nothing, but the more pain suffered the stronger the results.

Unbound Curse: You can ignore the Attunement requirement for cursed items up to your current Proficiency bonus. As a bonus gain 2 hit points per cursed object equipped.

Demonic Tinkering: (artificer only) when crafting magical object from the artificer table, you may roll (1d10) on the curse table and add a curse to the object.  

Curse Table 1d10

1 - You feel awake too awake: "why can't I sleep"
      Your Immune to sleep condition; you don't need sleep. You have a 1 exhaustion while this item is equipped.

2 - Your mind wanes of what you have done as you feel like you can eat anything.
     Loss -2 to Wisdom stat but gain +2 Con stat while this item is equipped.

3 - Your legs feel like lead as you stump around.
      Loss -2 to Dex stat but gain Immunity to Prone condition while this item is equipped.

4 - The warmth leaves you body and magic.
     Gain Resistant to fire damage, Vulnerability to cold damage. In addition all Fire damage you deal now does Cold damage while this item is equipped.

5 - Your blood feels like it burning.
      When every you are hit by a melee attack you and the attacker takes you Proficiency modifier as Acid damage while this item is equipped.

6 - Your body feels pumped as everything around you feels smaller.
     Gain +2 Str stat, your size increase to large while this item is equipped.

7 - Rage becomes you when loss you mind
     When you loss your concentration on a spell or enter the bloodied stat; you enter a stat of Barbarian rage while this item is equipped. 

8 - Hunger drives you. as you body feel frozen int time.
     You can no longer heal from potion or short/long rest. All of you melee spells and attacks heal you for half damage dealt while this item is equipped.

9 - Your mind is open as you feel the information of the world.
     Gain + 4 Int stat But gain vulnerability to psychic damage and disadvantage on all deception and insight checks. 

10 - The demon in your ear tells you what the runes say.
       Pick 2 curses to place on the object.