A Tier 8 horse can awaken into a Dream Horse through Courser Training.

The probability of each type of Dream Horse (Arduanatt/Diné/Doom) appearing can be viewed via the Probability Information window in the Courser Training menu.

▲ Select Courser Training with a Tier 8 Courser at the Stable

By using special ingredients, you can increase the Courser's Skill, Elegance, and Strength stats.

Once the total of all training stats reaches 200%, the Courser will finally be qualified to attempt Dream Horse Awakening.

▲ You can check the appearance probability of each Dream Horse via Probability Information.

If the training level of Skill is high upon awakening, the probability of obtaining Arduanatt increases.
If the training level of Elegance is high, the probability of obtaining Diné increases.
If the training level of Strength is high, the probability of obtaining Doom increases.

Also, if the total training level of a stat is at 200%, you will not obtain a Dream Horse corresponding to the 0 stat.

For example, if a courser has 200% trained with 100% Skill and 100% Strength, it has a 50% probability to awaken into Arduanatt or Doom, but 0% for Diné.

You can train up to 180% for each stat. When training is over 100% for a stat, it increases by 0.5 per training item.