Infused tails are visibly larger than standard sizes due to having a higher than normal mana capacity. If your elnin looks like it could probably use its tail as a comfortable bed it's probably an infused size... if your elnin looks like it could host a sleepover in its tail then it's probably :
(Yes, giga. Show me your gigatails xD) There is no precise upper size limitation to 4mp tail sizes and hair/earfluff lengths. At 4mp an elnin can basically circulate ambient energy through themselves to support any extra sizing. (I just ask that folks at least try to size responsibly, otherwise I might have to reconsider adding a size ceiling if people start doing tails the size of cruise boats >v>;;; )
A tail style with a wild nature to it. This tail style will always specify a variant to indicate what types of tails it features.
This tail style allows your nin to have a tail with an aquatic flare to it. (This tail style variant was previously called "Undine"!)