1

White Wisp - The user gains 60 feet of movement and are giving the Homing Attack ability.
Homing Attack - Allows the user to jump and strike 2d4 enemies dealing 1d6 bludgeoning damage each hit. If there are less enemies than rolled, hit targets again until the number is reached. The user is then moved back to the area in which he used the ability.

2

Yellow Wisp - The user skin becomes as hard as steel, and can perform a Drill Attack.
Drill Attack - Allows the user to drill into the Earth, any substance, and dig 40 feet to position under an enemy and burst up into that target.
The target takes 1d8 piercing damage. The user then can reposition itself with its remaining movement without worrying about the target's attack of opportunity.

3

Cyan Wisp - The user becomes a powerful Cyan Lazer.
Cyan Lazer - The user can choose an area to ricochet off of, creating a powerful lazer that cuts is a straight-line. Any creatures in this lazer take 2d4 force/radiant damage. The user then can choose to stop at any point of the line of the lazer, or he can take the route back, dealing an extra 2d4 force/radiant damage and returning to his prior position.

4

Blue Wisp - The user can control a huge Blue Cube
Blue Cube - The user can send out powerful shockwaves (30 feet) across the vicinity by slamming the Blue Cube into the ground, which have different effects on the objects in the area. Enemies caught in the shockwaves are hit with 1d8 force damage and have to make a Dexterity saving throw to not get knocked prone.
DC (14)

5

Green Wisp - The user gains the ability of flight (80 feet), and the ability to be mounted on. This allows any player character to either hold on to the user (1-handed) or piggyback ride the user (2-handed). The user can forcefully dismount the player, and vice versa.

6

Pink Wisp - The user's body begins to be covered by hard Pink Spikes.
Pink Spikes - The user gains +5 AC and can roll around the battlefield, stomping all enemies within 30 feet of the user for 1d6 bludgeoning and 6d2 piercing damage.

7

Purple Wisp - A Purple Aura begins to form around the user.
Purple Aura - This aura tries to consume all enemies (1d8 piercing damage) in the aura's vicinity. If an enemy dies from Purple Aura, the user and aura becomes 5ft larger, and lasts for 1 more round. This can go indefinitely.

8

Violet Wisp - A Violet Black Hole starts to form around the user. (5 feet)
Violet Black Hole - All enemies, objects, and players within 10 feet of the user are sucked into the Black Hole, insta-killing them and increasing the size of the Black Hole. This can go indefinitely. All enemies can resist being pulled by making a Constitution saving throw. If all enemies are not pulled in to the Black Hole, it dissipates. 
DC (12)

9

Orange Wisp - The user begins to shake vigorously and flies into the air at extraordinary speeds, becoming an Orange Rocket.
Orange Rocket - The user can propel up to 100 feet into the air, and crash down into any area that he can see. When he hits the ground, an explosion of 30 feet deals 2d6 force and 1d6 thunder damage. ALL creatures must make a Constitution saving throw to halve this damage.
DC (14)

10

Red Wisp - The user begins the burn on fire, allowing him to use Red Burst.
Red Burst - The user now has 4 charges of a 1st level Fireball built up inside him. Each creature within 20 feet of the user takes 4d2 fire damage. Half damage for passed Dexterity saving throw.
DC (10)