Trails
This doc goes into how to add trails in Roblox. The following page goes into all the Trail Settings in detail.
A Trail is a 2D texture that connects two different points over time the end result looks like a trail. With some tweaks to the asset you can get a wide range of results such as fire, electricity or just a cool phase appearance.
Add two 'Attachment's to an asset in your project with the '+' next to the asset, usually on the one part. But it is possible to have them separate for some unique results. One attachment is the top of the trail, the second is the bottom. Trails cannot connect to Parts on their own, they have to use Attachments.
Add a 'Trail' to one of the parts. It can be anywhere, but might as well put it on an asset related to the result.
Scroll down the details to 'Attachment0' and 'Attachment1' in the Properties Panel and select your two attachments accordingly.
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