Perceive health

Empaths have a special ability to PERCEIVE the life essences of the people and animals (and some highly-evolved intelligent plantlife) around them. This action trains empathy skill and Power Perceive skill. As they gain skill, these sensations gain clarity and they'll be able to pick out certain properties of the individual (whether in hiding, if they have a disease, etc).

PP/Emp Average	Ability
25	Empath, same room
50	non-Empath
75	critter
100	details
125	Empath, adjacent room
150	non-Empath
175	critter
200	details

Perceive Health Messaging

Messaging	Meaning
The presence of Name, a fellow Empath.	Empath
The presence of an unseen fellow Empath.	hidden Empath
The presence of Name.	non-Empath
An unidentifiable presence.	hidden non-Empath
The presence of Name, whose life essence is wavering.	>50% vitality loss
The presence of Name, whose life essence is almost extinguished.	>80% vitality loss
The presence of Name, whose life essence has a faint greenish tinge.	poisoned
You also sense disturbing black streaks about his/her life essence.	diseased
A relatively healthy presence nearby.	healthy critter
A malicious presence screeching in the far dark corner of your mind causes you to quickly open your eyes!	undead, evil, or cursed critter
A wavering life essence nearby.	critter with >50% vitality loss
The presence of a secondary shadow about yourself.	blood critter

Notes

1. The types of things you can sense (see above list and table) appear every 50 combined ranks between Empathy and Power Perception. It is possible you may get lucky and see them very rarely before this point, but it appears to always be close to the 50-rank mark (within 20 ranks).
2. The range you can sense seems to grow every 200 combined ranks in Empathy and Power Perception. It is similarly possible this will happen earlier than expected.
3. The total number of individual essences you can sense is also limited by your skill. If you exceed this amount, your senses will become overwhelmed and you will be stunned for a moderately long time. Though it will not always happen, you can receive internal injury to your head and nerves.