Each of these may be used just once! However, the abilities themselves are deliberately extremely broad: if you can remotely justify the scar applying, I'll make it work! When you use a scar, please clearly state the scar you're using in the relevant comment, as well as what overall effect you're trying to achieve.
Pierce through anything, whether physical or conceptual.
Bind two things together, so that they what affects one affects the other. (You may target yourself with this.)
Share a memory: cause someone else to experience one of your memories like one of their own, or experience someone else’s the same way.
Re: RULES
When you use a scar, please clearly state the scar you're using in the relevant comment, as well as what overall effect you're trying to achieve.