Iron rank perks (permanent, cosmetic only):

• White name in chat and the tab list

• /hat - wear any item as a hat

• Colour codes in chat (&a, &c, &e ...)

• /sign - rename diamond or netherite gear, bows and crossbows in an anvil and they get your signature: "Forged by <your name>" and the date

Gold rank perks (permanent, cosmetic only):

• Everything from Iron
• Gold name in chat and the tab list
• /nick - choose a nickname
• 25% chance to drop a player's head when you kill them

Diamond rank perks (permanent, cosmetic only):

• Everything from Gold
• Diamond-blue name in chat and the tab list
• All chat formatting (bold, italic, underline, strikethrough)
• Colours and formatting on signs
• 50% chance to drop a player's head when you kill them
• /seen and /joindate

Netherite rank perks (permanent, cosmetic only):

• Everything from Diamond

• Purple name in chat and the tab list

• Custom coloured and formatted /nick

• Colours and formatting on item names in the anvil

• Obfuscated (&k) text in chat and on signs

• 100% chance to drop a player's head when you kill them

• /playtime

• Join even when the server is full

• /phantoms off - no phantoms for you, ever

Insomniac perk ($5/month, cancel anytime):

/phantoms off - phantoms never spawn for you and leave you alone, even if you haven't slept for weeks

/phantoms on - turn them back on whenever you like

Stacks with any rank - you keep your rank, colour and prefix. Netherite already includes /phantoms.