You are Fey.

Your size is Medium.

Your walking speed is 30 feet, and you have a swimming speed equal to your walking speed.

You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray.

You can breathe air and water.

As a Ceffyl Dŵr, you can shift between your humanoid and Horse form at will twice per short rest.

In your Horse form you have a speed of 60ft, and cannot speak, however you can use the message cantrip. You have the following Actions

• Hooves. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (2d4 + 3) bludgeoning damage.
• Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: (2d4 + 2) piercing damage.

Additionally any unwilling creature on your back must make Wisdom Saving Throw (DC {{savedc:cha}}) or be stuck onto your back until you release them.

In Horse form you can use water and the space between worlds to speed up your travel. 

• You can have 10 anchors connecting you to bodies of water around the world. 
• Traveling between these anchors takes _________________ (percentage of less time, number of days, cuts travel time in 1/4? (Working on that)) 
• To create these anchors you must spend a Long Rest as one with the body of water, absorbing it into your being 

You know the spell sleep and can cast it once without using a spell slot. When you reach 3rd level, you can cast the charm person spell as a 2nd-level spell without using a spell slot. When you reach 5th level, you can cast the dominate person spell once without using a spell slot. This resets on a long rest.

Charisma is your spellcasting ability for these spells.

You know the shape water cantrip. Starting at 3rd level, you can cast the create or destroy water spell with this trait. Starting at 5th level, you can also cast the water walk spell with this trait, without requiring a material component. Once you cast create or destroy water or water walk with this trait, you can’t cast that spell with it again until you finish a long rest. You can also cast either of those spells using any spell slots you have of the appropriate level.

Wisdom is your spellcasting ability for these spells when you cast them with this trait.