You can get another Holy Avenger, but it won't show up in your list when doing invasions.
Holy Avenger / Discussion
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This is the discussion related to the wiki page Holy Avenger.
but did you check your inventory?. Allthough it may show as a drop it should'nt count towards or show up in your inventory.
Other forums and data sites are arguing this point, but none are positive nor specific as yet. Say you use your Excaliber in the new alchemy recipe for Soulforge, it is suggested the Excaliber recipe will return to your Alchemy tab, so you would be able to farm the Holy Avenger again. It is written, again elsewhere, "You can only have 1 Holy Avenger, 1 Excalibur and 1 Soulforge in your inventory at any time". Hmmmm ….
I have Excalibur and Holy Avenger in my inventory. Both showed up on my weapons list during my last invasion.
This is also a drop from Colossus of Terra
/forum/t-195796/holy-avenger#post-