Transforming Into a Level 1 Primordial

Grim Hollow Campaign Guide; Player Tools & Grim Hollow Player's Guide

Becoming a Primordial

There are several ways for a mortal to consume a primordial spark, but continuing to become an elemental takes concentrated effort. A mortal might be born with an elemental spark, gifted one, or they could gain one by consuming the power of an elemental. Once acquired, one must spend a great deal of time contemplating and understanding the spark to unlock its full potential. 
The process of attaining elemental mastery is dangerous.  The slightest slip in control can cause devastation on a massive scale. Such facts are why isolated individuals like druids, monks, or rangers are most likely to see the transformation through to its end.

Transformation Features 

A Primordial has the following transformation features
Prerequisites
Ability Scores: Constitution 13 or higher
Roleplay: Either through ritual, defeating a greater Elemental being, or some other means, you must consume a Primordial Spark. Some of your abilities require your target to make a saving throw to resist their effects. The saving throw DC is calculated as follows:  Transformation Save DC = 8 + your proficiency bonus + your Constitution modifier.

Level Milestones

The following are examples of possible level milestones for the Primordial:

• Defeat and absorb the power of a greater elemental 
• Claim an elemental node
• Make an alliance with a being from one of the elemental planes
• Use your powers to defeat an encroaching civilization
• Free an imprisoned or indentured elemental creature
  
  

Transformation Level 1

Starting at 1st level, you gain the following Transformation Boons and this level’s Transformation Flaw.

Transformation Boon:  Elemental Form

Your Constitution increases by 2 and your Wisdom score increases by 1. An ability score cannot be increased beyond 16 this way.
You become an Elemental in addition to any other creature types you are. Spells and abilities that affect Elementals of a specific CR do not affect you. 

Transformation Boon:  Primordial Affinity

While able to control all elements, your Primordial birth was sparked by one particular element: your Primordial Affinity. Your body is infused with malleable elemental energy. You must choose an element below and gain all the benefits of that element:

Air. You have resistance to lightning damage. In addition, you can channel the air currents around you to guide a ranged attack. Once on each of your turns, when you make a ranged weapon or ranged spell attack, you can make that attack with advanage. If you are in a location without an air current - such as underwater - this feature has no effect.

Earth. You have resistance to poison damage. In addition, whenever you gain temporary hit points, you gain that many plus your proficiency bonus instead. 

Fire. You have resistance to fire damage. In addition, whenever you deal fire damage, you can add your Constitution modifier to the damage dealt.

Water. You have resistance to cold damage. In addition, whenever a creature regains hit points due to a spell or feature you control, you can imbue them with healing elemental energy. The creature regains additional 1d6 hit points. Only one creature who regains hit points from the spell or feature can benefit from this.

Transformation Flaw: Planar Binding

Your body and soul are bound to a primordial plane of existence. You have disadvantage on death saving throws as the plane attempts to pull you back to it. If you would be killed, your soul is taken back to a plane of existence of the GM’s choice. This plane is your new home, and you become an NPC under the GM’s control. If you are on the primordial plane responsible for your transformation, this flaw has no effect.

The city dwellers raise their eyes to a floating figure barely glimpsed through the smog-filled sky. Their cries ring out as the figure, wreathed in flame, clenches a fist, causing the earth to tremble violently. The crushing weight of water is the last sensation the people know, as their filthy streets are washed clean.
The primordial throws her head back as she exhales a gout of flame. Her charred skin rapidly heals as she wades free of the molten lava, laughing all the way. Her companions look on in horror as she calls to them, “I have heard it. I heard the song of creation!” 
Primordials are born when a humanoid absorbs a spark of primordial chaos. The primordial forces are the purest building blocks of creation, and a fostered spark quickly grows to an all-consuming flame. Mastering the elements requires unlearning the limitations of mortality, a process that spurs rapid transformation.