The anvil is where metal is shaped under the hammer, read as hardship that forges character. It stands for endurance and a period of being tested and formed.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.