Lord Oberon said:
Seems like everyone didn't actually pay attention to the fact that all these items can be obtained using Soulstones. It's supposed to be like this: you win at Tournaments, get Soulstones and buy items for them if you wish.
Yes, these items can be bought for Sapphires (why not?) But are you willing to use your 2000 Sapphires to protect your castle for one day? Would that be a wise decision? It's only for you to decide.
I can see this as a good and a bad thing. It does allow a player with a big wallet to attack with impunity, for a price. The cost of being perpetually invulnerable is high, but I'm pretty sure there are players who could easily afford it if so inclined. Whether or not it becomes a fun killer is hard to predict, it depends on how many players use it and how they choose to use it.
I can see it as nice "vacation insurance" if you have the soul stones (or $) and know you won't be able to log for a few days. Spending for that might make the game more enjoyable than becoming someone's favorite farm while you're away.
Questions about how it works:
1) If you use one when at attack is inbound, does it keep the attack from hitting you?
2) Is there a maximum? What I mean is whether someone can perpetually be invulnerable or is there a waiting period between uses or after a certain number of uses (teleport makes you wait before moving again)?
3) Are you able to attack others while under this protection? If players can, I'd suggest changing it so that players can't. I have no problem with people wanting protection when they can't play, but being hit repeatedly by people who buy perpetual invulnerability would get old fairly fast.