This tag is mainly intended to work with an xpTrail object when an xpTendril modifier is being used.
The tendril actually consists of a long stream of particles, which are constantly being created, moved and destroyed.
This makes it impossible to know at any time which particle is at the tip of the tendril.
With this tag, you can add a separate particle to tip of the trail in either xpTendril or standard (unconnected) xpTrail modes.
Note: It will not work at all in any other mode.
xpTrailTip menu settings.
Drag the emitter which will generate the tip particle into this field.
You can use the same emitter used to create the trail, but the results may be unexpected.
In general, it is more advisable to use a different emitter.