Spirit Speak is the skill of communication with the dead.
Using the Skill
To attempt to Spirit Speak, click the blue diamond beside the skill in the skill gump. If you are successful, you will be able to understand words spoken by a player in ghost form.
At 100 skill points in Spirit Speak, you can automatically hear anything said by a ghost(player). You can also be clearly heard be anyone as a ghost.
Those with lesser skill will need to make manual attempts to use the skill. Spirit Speak will last for a short duration before the skill must be invoked again. Of course, the higher the skill, the better the chance at success.
*Note: This skill is considered a useless skill and mainly used for role playing purposes.*