PvP (player versus player) is an integral part of Elden Ring. Every time someone opens up their world to others (even a friend), chances are that they will get invaded by someone else.
Despite that, there are a few rules that users should inherently follow to ensure integrity as an invader. These are not rules that FromSoftware has devised, but individuals should try to maintain them regardless and ensure a seamless experience for both parties.
Note: The author has not made these rules. Rather, these are rules followed by prominent PvP players such as FightinCowboy, Scott Jund, Oroboro, Prod, and others. This article was written based on FightinCowboy's list of etiquettes as reference (video attached above).
Crimson flasks are the primary means of healing in Elden Ring. Players can make these by exchanging Golden Seeds at a site of grace and using them against bosses.
However, in PvP duels, it is etiquette never to use these Crimson flasks. It is recommended that users clean up the Crimson flasks before the duel officially begins.
They can still use things like healing incantations if they are part of the build, but Crimson flasks are a strict no during invasions.
Mana flasks are allowed for usage in PvP, as without them, sorcerers cannot cast spells. However, in the case of Wondrous Physick, things can be a bit complicated.
The problem is that several crystal tears have unique buffs that can negate builds by others. Things like purifying crystal tears have the potential to provide unfair advantages when against other gamers.
So it is up to the hosts to decide what they want and what they do not. The problem is Elden Ring does not have any voice chat, which means players have to personally text each other and decide on what is
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