In Lucumi, "ase" refers to the power of intention and will. It is a concept that signifies the ability to manifest one's desires through the power of thought and action.
While "ase" is not a Yoruba word, it has become popular in some circles as a way of expressing the power of intention and positive affirmation.
However, if you're looking for a similar concept in Yoruba, you might consider "agbara", which means "power" or "strength".