I can't enchant my bow pass +3 with Relic Fragments
The revamped Avatar weapons don't need more stages, since what used to be the +3, +6 and +9 lines were condensed down into coming at +1, +2 and +3.
So pretty much just some further streamlining of the leveling process. If you're looking to take it higher due to some guide that you found then the guide is outdated on this topic. +3 for the weapon is fully enchanted during the level 1-64 phase.
You'll get weapons that can enchant past +3 once you reach level 65.
Alright so I once met someone who was around level 30 with a weapon with a red background, and it was level 9. I've also acquired a red background item myself, but I can't enchant it. What are these weapons?
As far as I understand it, those are the remaining vestiges of the previous dungeon drops. There used to be superior quality (the golden name color) items from bosses distinct from what was also put into the leveling tokens (XXII, LV, ... Token). Some of those could even get enchanted to +12, requiring an item that you could realistically only acquire via gameplay if you had access to a level 65 character already.
For some reason they seem to still not have fully purged them from the drop tables.
The weapons always were effectively inferior to the Avatar weapons for all intents and purposes, even if they had slightly more attack directly on them or different roll options, since the increased crit chance and other lines on the Avatar weapon pretty much trumped them badly. (Which of course makes sense since they predate the Avatar weapons even existing.)
To say nothing about how very pointless the resource expenditure to enchant them was/is compared to how they only last for one to three dungeon runs before you're into the next one and replacing them already. Which is another thing that seems to have pushed for moving to the current +3 only approach.
A red inventory background should indicate that you aren't meeting some of the requirements for the weapon. Be it level, class or even race on some. The specific requirements not being met should also be shown in red on the mouse over item description.
Also, not all weapons or armor can be enchanted during the level 1-64 phase, so that can be another reason for why it may not go into the enchanting/forge window. Some items may also require that you first set their options (enigmatic items, the items with a question mark on them, may fall into this category, though some may also be possible to enchant without removing the enigma) or that they are bound to you (having been equipped at least once) before they can be enchanted.
If you meant some other kind of red item then I'm not aware of them, though they could have added them during one of their most recent tweaking of the leveling process, since it's been some time since I've last leveled a new character.
Thanks for you detailed response.
Basically, the background of the weapon box is a red-purple gradient and the name of it is light blue. To be more specific it's a bow called 'Verity' which I got from a dungeon. And yeah I guess this was an enigmatic weapon because I had to choose the stats of it and then soulbind it.
Provided it's this bow, then it's just a case of an item that can't be enchanted. I've never managed to work out if there is some kind of visual indicator on the icon for this state, since the color gradient that you noted doesn't seem to serve that purpose.
Usually I just rely on if the item gets grayed out when I open up the enchanting/forge window to tell one way or the other, if it isn't noted somehow on the tooltip.
The parts of the icon that give information are:
There used to be a Masterwork indicator as well, if memory serves, but I haven't seen that in a long time, so not sure where that went, bottom right I think, but, well...