Well it's been a few days, so I figure, why not? Are you ready to solve another Add-A-Gram chain? Each word can form the next word by adding a letter and then forming an anagram. For example, an insect in a beverage in red wood would be bee -> beer -> ember.
Here is today's Add-A-Gram chain definition:
a natural base in a grapheme in a division in a chieftain in imbibe in an extension in a Plymouth in a piece of pie in a metamorphic rock in a precept in surpassing in pertaining to two related systems in prophylactic repeating in neutralizing.
As always, happy Add-A-Gramming!