The grave keeper, the old snake, gave no key instructions.

In the game "Gravekeeper", if the old snake does not give the player key instructions, it can be obtained through the following steps:

1. Go to the church research desk and look for NPC astrologers.

2. Talk to the astrologer and choose to ask for the key manual.

3. According to the requirements of astrologers, complete the corresponding tasks, such as providing materials and divination.

After completing the task, the astrologer will give the player a key instruction to make the key.

Please note that the specific process may be different due to the game version or updated version, and it is recommended to refer to the official game guide or related guides.