You climb at half speed.
If proficient: You instead climb at normal speed.
Attribute improvement: This ability sets your INT score to a minimum of -2.
You dig at quarter speed.
You become hidden. As you do this, you may roll 1d20 + SNK. If this is greater than your passive sneak (10 + SNK), then you use it as your hidden DC. If not, use your passive sneak.
When you are hidden, you cannot be seen. This condition is always associated with some hidden DC it takes to see you. Unless otherwise noted, it's your passive sneak (10 + SNK). Other creatures will only be able to see you (or know that you're there) if they use some relevant ability that lets them do so, if their passive perception (10 + PER) is greater than your hidden DC, or if enabled to by some other effect. In most cases, a creature trying to see you will have some check which must pass your hidden DC.
While hidden, if someone knows where you are but is unable to see you, any attacks they make against you are done with disadvantage. Similarly, any attacks you make against someone that can't see you are done with advantage. Attacking causes you to no longer be hidden.
While hidden, you must not Move faster than your hidden speed. Any other movement effects require a DC 15 SNK feat save to remain hidden.
If proficient: Instead roll 1d20 + SNK + P for your hidden DC (if it's greater than your passive sneak). If fluent: Instead roll 1d20 + SNK + F for your hidden DC (if it's greater than your passive sneak). Attribute improvement: This ability sets your SNK score to a minimum of 2. Feat save improvement: This ability gives proficiency in SNK feat saves.
You cannot use items in your hands.
Attribute improvement: This ability sets your MOV score to a minimum of 0.
Attribute improvement: This ability sets your PER score to a minimum of 0.
Attribute improvement: This ability sets your STR score to a minimum of -2.
You become resistant to effects that would make you snared, effects that would make you immobile, and to hack damage dealt by other creatures.