What would your special unit be able to do?

[TheGreatErenan]

What about this:

A unit that cannot attack, but can "root in" or "shell" a la Bramble or Bombshell, and once it has done so, other friendly units can use their action for that turn to touch it and get healed. When I say they use their action what I mean is that units cannot both touch the healing unit and attack in the same turn. I'm thinking this special would have to be unable to unshell and shell on the same turn, or else it would be unable to heal anything until the following turn after it shells itself (like Bombshell being unable to shoot until the following turn).

Thoughts? OP, not very useful, just right, etc.? Thoughts on possible adjustments to this?

I was thinking about either a jungle or desert themed team as my idea for a new one, and I think this might fit with either one. Some kind of golden idol or obelisk on spider's legs or something like that.