Arryn's Heart

The heart of ice elf queen Arryn Frostmourn, removed and sealed by herself after her forced transformation into a Lich. Betrayed by her closest retainers in a deal that made them powerful devils, the queens body was sacrificed to Archdevil Levistus, Lord of Stygia, and raised as an Archlich using his magic. However, the queens ego, though fragmented, resisted becoming a thrall, slaughtering her former retainers and most of her kingdom in madness prior to being sealed towards the end of the War of the Ancients. Using the knowledge of Golog Stonesmelter, Arryn then removed the heart and sealed both it and her phylactory, freeing herself from the influence of Levistus at the cost of crippling her abilities. The heart is a pale blue, and is freezing cold to the touch. It is smaller than the average heart, and beats slower as well. It contains remnants of both the elf queen and the Lord of Stygias powers.

Replacement Heart: Arryn's heart can act as a replacement heart for any medium-sized humanoid creature. If a creature chooses to replace its heart with Arryn's heart, the following applies:

 Warrior Queens Constitution: Remnants of the elf queens powers remain within the heart, but so does her frailty. The following ability scores are increased or decreased:

• The attuned creatures DEX score increases by 2. 
• The attuned creatures INT score increases by 2
• The attuned creatures CHA score increases by 1
• The attuned creatures CON score decreases by 2
• The attuned creatures STR score decreases by 5

As the heart belonged to an Ancient, bonuses from it may exceed the maximum level of 20 per ability score.

Eternal Ice: The attuned creature is immune to the effects of cold weather and cold damage, but is vulnerable to fire damage

Ice Queens Authority: Creatures with the attribute of "cold" are likely to be friendly towards the attuned creature if they would otherwise be neutral, and are likely to be neutral if they would otherwise be hostile. Friendly creatures may be willing to offer information or perform small favors for the attuned creature if persuaded

Pinnacle of Archery: During her life, the elf queens archery touched the realm of the gods. The attuned creature gains the following benefits:

• The creatures walking speed increases by 5 ft.
• The creature is under the effects of the feat "Elven Accuracy"
• Evasive Fire: After making a ranged attack, as a bonus action the attuned creature may move up to 10 ft. directly away from its target. This action does not provoke an attack of opportunity even if there is an enemy within 5ft., so long as that enemy is also the one targeted for that ranged attack, which still has disadvantage under those circumstances.
• Ambusher: The attuned creature has advantage on attack rolls against any creature it has surprised

 Archdevils Anger: Due to being unable to turn the elf queens corpse into a thrall, Levistus has cursed the heart. The following conditions apply:

• The attuned creatures Armor Class is decreased by 2
• The Archdevil Levistus, Lord of Stygia, will become aware of your existence, and may attempt to reclaim the heart through various means
• If the attuned creature attempts to replace the heart, its mind and soul will be destroyed, and it will be resurrected as the Lord of Stygias thrall
• Levistus may attempt to influence your emotions and decisions at crucial moments

 Ice Queens Descent (1/2 Weeks): The attuned creature may borrow the power of the elf queen. As an action, the terain in a 120 ft. radius around the attuned creature manifests into the elf queen's frozen domain. The following conditions and benefits apply within the domain:

• The domain remains for up to an hour, and can be dispelled by the attuned creature at will. If it remains for the full duration, the terrain changes permanently
• The domain is considered a magical effect until an hour passes, and can be dispelled via Dispel Magic (Spell DC 20)
• The area within the domain is considered difficult terrain for all creatures outside the one attuned to the heart
• The domain contains 6 charges. You can use an action and expend 1 or more charges to cast one of the following spells (save DC 16) from it: Armor of Agathys (1 charge), Slow (3 charges), Ice Storm (4 charges) or Cone of Cold (6 charges). All spells cast at base level. If all charges have been expended, the domain disappears

Avatar: Within this domain, the attuned creature becomes an avatar of the elf queen, becoming subject to the following effects: 

• The creatures Armor Class increases by 2
• The creatures walking speed increases by 5 ft.
• The creature is under the effect of the spell Fire Shield 
• The creatures attacks all deal an additional 1d4 cold damage, and their attacks are treated as magical for the purpose of overcoming resistance
• The attuned creature is aware of the exact location of all creatures within the domain, including those that are invisible or otherwise obscured. Such creatures do not benefit from the advantages of spells such as Invisibility against the attuned creature
• Once the power of the domain wanes, the attuned creature must succeed on a DC 15 Constitution saving throw, or gain a level of Exhaustion. If the saving throw fails by 5 or more, then the creature gains 2 levels of Exhaustion, and if it fails the saving throw by 10 or more, 3 levels of Exhaustion

Notes: Immunity: Cold, Vulnerability: Fire, creature that has atleast 18 Dexterity and is not attuned to other Artifacts of the Sealed