There's no crystal-specific config — the community configs are made per server/anticheat, not per playstyle. Run .config list in-game to see what exists and .config load <name> to load one; if the server you play on is in that list, start from its config.
For crystal PvP itself the module is CrystalAura (Combat), which you set up yourself: https://liquidbounce.net/docs/modules/combat/crystalaura
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