i have a suggestion for item name swap and it doesnt fit the event title...but then again, nothing is definite, not even the title
instead of using royal artifacts (i personally have no problem if you keep it that way as a tie in with the event title), how about 'avatar' (i dont want to say pet because we already have another event with a complex pet system)
something like :-
shoes -> Mind Flayer
robe -> Blue Crawler
scepter -> Steam Machine
throne -> Toadfish
crown -> Ice Dragon
just using Water because they have some diverse creature cost among all
OR using diverse creature types but with no confusion about which fares better among themselves like :-
shoes -> Photon
robe -> Antlion
scepter -> Fallen Elf
throne -> Immortal
crown -> Phase Dragon
you know instantly which is better ( Photon < Antlion < Fallen Elf < Immortal < Phase Dragon )
OR using in-game rare weapon as item, again using quanta cost as point of reference
shoes -> Vampire Stiletto (
)
robe -> Druid Staff (
)
scepter -> Lobotomizer (
)
throne -> Pulverizer (
)
crown -> Eternity (
)
personally, like i said before, theres nothing wrong sticking with what you've got but if you want to make it more elementsy you can use different category than 'items', this would require event name/title change but i'm sure you can still make it work
again, just my personal opinion