Tremorsense
This is technically more powerful than Blindsight. It allows you to see through Major Image, and gives away invisible creatures. Unlike Blindsight, it can detect things or creatures behind total cover. You're able to use this to feel tremors within another person's body through touch, as they are involuntary, rhythmic muscle contractions.
You may see
- The real weight of something
- The real shape of something contacting the ground
- The real gait
- The real pressure pattern
Blindsight
It is important to note that just because you have blindsight does not mean you can see through disguises. If a creature is invisible and stealthing, you still must make perception checks to see them within your blindsight radius; but if they are not stealthing and are invisible, they're basically walking out in the open to you.
It acts as a non-visual sense (like smell or hearing) to detect surroundings, but it does not automatically detect anything intentionally hidden or behind total cover.
It defeats
- Silent Image
- Minor Illusion
- Invisible condition
- Magical Darkness and darkness
- Blur
- It can see a creature holding two fingers up
- Abilities that try to mask your movements such as Displacement and Mirror Image
It loses v.s.
- Disguise Self
- Seeing Color & facial expressions
- Major Image
- Pass Without Trace
- All other Illusions above 1st-level