Approved mods
FPS Reducer

OptiFine

Minecraft Shaders

AutoSwitch

Better Sprinting Mod

ChunkBorders

Client Tweaks

Crafting Tweaks

EasierCrafting

EasyVillagerTrading by Giselbaer

Extended Hotbar

Item Scroller

Light Level Overlay Reloaded

MineMenu

MiniHUD

Mouse Tweaks

Roughly Enough Items (REI)

ToroHealth Damage Indicators

The use of minimap addons are allowed as long as they don't show caves

Shader & non-xray texture packs

No begging. Asking nicely once or twice is acceptable
No one likes being begged for anything, keep this to an absolute minimum. If you do beg for items you might find yourself muted or banned.
No griefing. Please do not destroy, deface, graffiti, or build on top of another person’s constructions.
You would think this one is obvious, common sense sadly isn't so common.

This includes any sort of addition or modifacation to others builds, doing this without their permission will be viewed exactly the same as if you removed their build completely even if you think it looks better pink.
Treat others with respect.
There’s no need to say or do things to make others feel bad or upset. Trolling, generally defined as provoking a person/situation to get a response, is also not allowed. This rule also encompasses intentionally trying to kill users in non-PvP zones.
Offensive content is not allowed.
While some minor amount of swearing is allowed, severe or frequent vulgarity, especially when directed at others, is not. Offensive item/mob names, skins, minecraft structures and usernames are not allowed, and you are required to change or remove any if asked by a staff member.
Keep chat family friendly.
Chat should be family friendly. This means certain subjects are not allowed in chat. These include, but are not limited to, discussions about sex, politics, religion or drugs. If a staff member asks you to move a conversation elsewhere or drop one, you should do so.
Advertising is not allowed.
Advertising other Minecraft servers is strictly banned. You also may not advertise websites, YouTube channels, Twitch streams, or anything else if it is not related to Tellus.
Allow moderators to do their jobs.
You may not attempt to do a moderator’s job in threatening to punish players for breaking the rules. You are not allowed to argue against any decision made by a staff member regarding enforcement of the rules in any public channel. If you do disagree, please contact that staff member privately to resolve the issue, and if you cannot, contact administration via our helpdesk.
Spamming is not allowed
Spamming is filling chat with multiple unneeded characters or messages. Don't do it.
Cheating is not tolerated.
Cheating in any form is not allowed. Anything that would give you an unfair advantage over other players is considered cheating. This can include client mods to generate items/money easier or faster than otherwise possible, abusing server bugs or using alt accounts to directly financially benefit your main account.
Trading For Real Items
Transactions to buy or in-game items for real money or other external products are not allowed. This includes minecraft accounts!
Do not scam other players, or try to.
Scamming is taking money, items, work, or anything else of value from another player dishonestly. This includes teleporting people into PvP areas without their consent.
Be mature adults
This server is meant to be drama-free. Anyone participating in word-sniping, bickering, pettiness, etc. will be kicked on the spot. Insistence on participation in drama will result in a ban.

We are not in the habit of policing chat, but some words and sentiments have no place in conversation other than to discriminate or inflame. Be respectful. Those intent on creating a toxic environment will be banned.
Looting of any kind is strictly prohibited in or near any well-defined player bases.
It doesn't matter if the player is inactive or has containers set to true in their residence or doesn't have a residence at all. If it's not yours, don't touch it. That said, you should still protect your stuff. We can only roll things back so far, so if your stuff is unprotected and you've been offline a while and someone breaks the looting rules, you may have no recourse.
Looting is only allowed:

In the wilderness, well away from any residences or developed areas. Unprotected mining outposts in the resource worlds, for example, are fair game. That said, while looting an unlocked chest is allowed, you can not break any blocks to get to it. That would be griefing.

If the owner specifically grants permission for it. Burden of proof of permission falls to the looter.

Even in cases of legal looting, don't be greedy and wipe the person out. This is still a community and we still need to be respectful.
Don't AFK for extended periods of time,
This takes up server resources and compromises mob spawning for everyone else in the world.If you aren't actively playing the game then log out.
Attempting to get around AFK timers with minecarts or boats, etc. will result in a kick and/or a ban.
English only, please
Including all chat channels. While we celebrate the many cultures our server represents, our already loosely-moderated chat is impossible to manage in multiple languages. Even if you want to swear at that creeper that killed you while AFK, do it in English.
All things in moderation
Don't cause lag with excessive TNT, entities (farm harvests, ore mining), etc.

Be aware that our lag monitor will cancel large events, so you can lose items if harvesting/mining large quantities in mass, and these will not be replaced by staff.

Players who create builds with the intent to lag or crash the server will be banned. No over-the-top farms will be allowed. You're not impressing anyone.

Your massive mob farm will not get the rates you're expecting on a server and it will only piss off everyone else. You’re not trying to feed an entire country.

You really don't need 20 double chests of melons and pumpkins and cactus (e.g.).

Instead focus your energies on creativity and building something pretty rather than laggy.
Don't run high-frequency clocks. All redstone clocks must have an “off switch”.
Again, this takes up server resources and causes others to lag. If you need a clock make sure it's running at a reasonably slow tick rate to avoid annoying everyone else, and never leave it running if you're AFK or not in the area.

This is disrespectful to all of your fellow players. Find ways to run your farms without clocks.
Please be moderate with your hopper use
as these can create more lag than a running clock.

We use a hopper timings limiter and large amounts of items dumped into a hopper system will likely result in a clog or severely slowed transfers. Instead, for any item inputs into a hopper system, we recommend setting a single chest on top of the input hopper so items go in one at a time. Any excessive hopper use will be remove with warning.
Hopper minecart collection systems are a pretty terrible idea, especially when those carts are constantly moving.
Please avoid these whenever possible, and it’s almost always possible. Stationary hopper minecarts are preferred, when kept in low numbers.
Keep farms and mob grinders to sane levels, with no more than 1 farm per mob/animal/plant type
Same as with AFKing and clocks, a large amount of mobs/animals/plants causes lag for everyone on the server and reduces the number of spawns for everyone else.

50 mobs/animals equals one player in server resources, so we have set a limit for most mob types of 50 per area. Any entities beyond that risk automatic or manual removal, and we will appreciate it if players themselves manage entities — if staff need to intervene we will be much less choosy.

All of those growing plants are one of the laggiest types of blocks in the game since they constantly require updates.
Ask before building in a town or near anyone else's area.
Anyone can claim an area by clearly defining a boundary (walls, fences, natural boundaries, etc.). Unless you have explicit permission, keep builds at least 250 blocks away from your neighbors.
PvP Rules
PvP is enabled by default, but consent must be obtained. You still cannot spawn camp or grief anywhere. If a player does not consent you are responsible for returning their inventory even if you lost it.

Any repeated killing of players without consent will be considered harassing and you will be banned.