[quote=@jynmi88]
[@Letter Bee]

<Snipped quote by Letter Bee>

A Logia Devil Fruit allows the user to transform to create, shape, manipulate, and most importantly, transform into a certain substance/ element.  While their in their element state a logia user becomes immune to most physical attacks.   I say most because haki is able to cause user's harm in their transformed state, but depending on what the element/material is, there could be others.  For example a fire Logia user was damaged by a lava user because lava in the show is a superior form of heat than fire, or a electric type user was harmed by a rubber user because rubber is an natural insulator.  
---Also logia users are weak to the same things as other Devil fruit users.
[/quote]

All right; that sounds reasonable.