When a Legendary enemy is defeated in Fallout 4 they "drop" a Legendary item. These items are randomly generated but the "level" of items (ie. usefulness, value) appear to increase as the player progresses through the game.
Travelling East or South early in the game exposes the player to higher level enemies so it is possible to engage with enemies many levels above the player.
If a level 10 player defeats a level 30 Legendary enemy would they get the same "level" Legendary item (ie. usefulness, value) as a level 30 player defeating a level 30 enemy?
Best Answer
Items in Fallout 4 don't have levels, not in the way many players are used to anyway. An unmodified Pipe Pistol has the same "level" as a fully modified Combat Rifle. But we can all agree that the Combat Rifle is most likely alot better than the Pipe Pistol. That said, the level of mobs does correspond to the quality of items they carry. You will not see lower level mobs drop Combat Rifles or Combat Armor.
To answer your question: there is no rank or level among legendary item effects. You are as likely to get a "Crippling" as you are a "Wounding" effect on your loot, no matter the level of the mob. However, the modding system of Fallout 4 allows you to modify your weapon very freely.