Instead of placing a sentry, you now place a mini sentry with legs that follows the enginner and supporting in battle from the ground, shoots enemies who are in range or whatever the engienner is shooting at.
+Costs 80 metal to build
+follows and jumps anywhere you go
+10 attack speed
+10 faster turn speed
+ can build 2 sentries
-does not stay put to defend a area
-low health and damage
-cannot be upgrade
-explodes after 30 secs
-takes 3 seconds of wind time