If you're looking for a simple mod that make the game harder, this could be what you're looking for.

This mod give you negative effect in your Minecraft playthrough.

Features:

- Heatstroke: Give player Weakness and Slowness or Mining Fatigue when player is on fire more than 5s in hot biome.

- Broken Leg: Take fall damage equal or more than 1 heart will give you Slowness (duration increase base on the damage you take). Take equal or more than 5 hearts damage will give you addition Wither effect (duration increase base on the damage you take).

- Lack of Oxygen: Stay above build limit longer than 5s will give you Nausea, longer than 10s will give you addition Wither effect.

- Drowning: Take drowning damage will randomly give you Nausea.

- Frostbite: Stay in cold biome (including ocean and the end) for more than 1m without heat source on hand or nearby will give you Hunger, 30s later will deal Frostbite damage every 5s (damage increase over time).

- Food Poisoning: The food you eat has a small chance to be a bad food and give you Poison effect and Nausea. Raw food has higher chance give you Food Poisoning.

- Stuck: Suffocated in a wall has a small chance to give you Mining Fatigue.

- Stun: Taking explosion damage will give you Slowness (duration increase base on the damage you take). If you take equal or more than 5 hearts damage, you will gain addition Nausea.

- Karma: Killing Villager or Iron Golem has a high chance to give you Bad Luck effect. You now randomly got struck by lightning while having Bad Luck effect.

+ Vision Disrupt: Taking magic damage randomly give you short Blindness. If you're having Poison effect, this will not trigger because Poison damage is a magic damage (yea, i know, i was surprised when i know this too, Mojang define Poison damage is a magic damage).

+ Broken Hand: Breaking tree log, glass or glass panes with your bare hand will randomly hurt your hand. If it's a glass or glass panes, gain addition Wither effect.

+ Infection: Taking cactus or berry bush damage will randomly give you Poison effect, wear more armor will decrease the trigger chance. Wear both boots + leggings will prevent this effect trigger for berry bush, wear full set of armor will prevent this effect trigger for cactus.

+ Head Bump: Hit your head to wall while flying will give your short Blindness and Nausea (Nausea duration increase base on the damage you take).

+ Exhausted: Stay awake for more than 3 days give you Slowness, Weakness and Mining Fatigue. The debuffs will get worse if you keep staying awake.

Everything can be disabled in config.

Note: This mod can work on server side (client don't have to install).

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My other projects: https://www.curseforge.com/members/ducvn1882/projects

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Bad Effects