The Celtic Forest and Hunt Goddess, Abnoba is quite a difficult deity to research as not much about her has really survived. In many documents, she is referred to as an interpretation of the Roman Goddess, Diana, and may be referred to as "Diana Abnoba".
During the Roman era, she was worshipped predominantly within the Black Forest, and there are altars and shrines dedicated to "Diana Abnoba" that can still be found near the mineral springs of Badenweiler.
Name:
The etymology of her name is obscure, although thought to be Gaulish in origin, and thought to be a geographical term to mean "river" or "water".
Her name has been lent to various areas, including a range of mountains where the Danube River flows (according to Roman historian, Tactitus circa 56-117CE). It is thought that the river Avon in the South West of England was named after this Celtic Goddess. There is also a Roman settlement found close to the River Avon, near the City of Bristol, named Abonae. It is thought that it was established as a military town and fort, but now lies buried.
Associations:
Like Diana, she is considered to be a Goddess of the Hunt. As her name suggests, she was strongly associated with water, nature, and the forests. She may also be associated with fertility, childbirth and healing, with some believing the springs she was linked to, have healing powers.
It is generally thought that she can be petitioned to aid with the protection and healing of animals, and to help with the preservation of wild areas, forests, and plants. As an Earth Goddess, it is likely that she can also aid with grounding.
Due to her associations with the Danube River, and that she is thought to be its source, it could be argued that she is a creator, and a source of life.
Offerings and Rituals:
As August 13th is known to be a day that was used to honour Diana, it could be that Abnoba can also be celebrated then. If you choose to follow this, it would be respectful to place a bowl of spring water on your altar as an offering to her. You could also decorate your altar with pine cones and images of forest animals, such as deer and rabbits. Rituals could include cleansing, and working with the element of water.
According to my research, she is likely to enjoy Black Forest cake and spring water as an offering. As an Earth Goddess, she is likely associated with the colours green and brown with regards to candles, but make sure any of your offerings are environmentally friendly.
Other ways to worship and show respect for Abnoba could include taking part in a river clear-up, planting trees, and supporting charities linked to the environment and endangered animals.
Resources:
Judika Illes, "Encycolpedia of Spirits"
https://www.ancienttexts.org/library/celtic/jce/abnoba.html
https://gullveigpress.wordpress.com/2019/08/05/festival-of-abnoba/
https://discover.hubpages.com/religion-philosophy/Celtic-Goddesses-Abnoba
https://historicengland.org.uk/listing/the-list/list-entry/1408558