These rules have been agreed, pretty much tpvp but a couple changes.
3 players from both guilds will play a Bo5. Shards Banned.
Both guild assign a team element for all 3 players and an individual element for each player. Each player must choose element from a different tier:
Tier 1:

Tier 2:

Tier 3:

Also, for each match, a battle element that is different to both teams' element and individual element for that duel, will be rng'ed.
Deckbuilding:
- Full Upgrades
- No "Other" Cards
- Mark cards treated as pillars.
- Decks can be changed between games
- Max 2/3 of your deck from one element.
Also, bolts, i believe you can't use pillars/pends/marks of element that's not available for duel. Correct me if that's wrong.