Make It Hot

Make any block, item or fluid dangerously hot.

Make It Hot lets modpack developers mark blocks, fluids and items as hot. You decide what is hot (exact IDs, whole mods, tags or custom groups), how close is too close (0 means touching) and how much it hurts. Heat damage is real fire-type damage (makeithot:heatstroke), so Fire Resistance, Fire Protection, fire-immune mobs and armor all protect you the vanilla way, and per-armor insulation sits on top of that. Ignore the heat for long enough and you die of heatstroke.

Every value the mod uses lives in one ordinary config file, config/makeithot-common.toml. You can edit it from the title screen with no world open, or with an operator command.

Author: kreezxil · Minecraft 26.3 · NeoForge 26.3.0.101+ · Java 25 · License: MIT

Features

Out of the box

• minecraft:tuff is hot to the touch: 1.0 damage (half a heart) per hit.
• minecraft:deepslate burns from 3 blocks away: 2.0 damage (one heart) per hit.
• Lava (source and flowing) radiates heat 1 block out: 0.5 per hit.
• Holding a lava bucket in either hand: 0.5 per hit.
• A dropped magma block within 1 block: 0.5 per hit.
• Damage lands every 10 ticks (twice a second), which respects vanilla's hurt cooldown.
• Hot biomes (#c:is_hot) are ×1.25, cold biomes (#c:is_cold) ×0.75, and the Nether adds +0.5 per hit.
• Leather armor insulates (×0.90 per piece), netherite ×0.85, iron and chainmail conduct (×1.05) and gold conducts more (×1.10).

Every default can be deleted or replaced, and a list you empty on purpose stays empty.

Define anything as hot

• Rule format: target;KIND[;proximity[;damage]][;key=value...]
• Targets: modid:id, a whole mod (modid or modid:*), a #tag, or a custom $group.
• Kinds: BLOCK, FLUID, ITEM_HELD, ITEM_INVENTORY and ITEM_DROPPED.
• Proximity runs from 0 (touching) up to 256 blocks. 8 is recommended for radiant heat. It is measured as a box around your body, not a sphere.
• Custom groups use Coal Explosion's style of nested arrays. Groups can nest (cycles are logged and broken), and one group can mix blocks and items.
• A group is only a named list: on its own it does nothing. Putting a block in a group does not make it hot; a heatRules line has to use the group as $name. For example, a group overworld holding minecraft:grass_block burns only after you add the rule $overworld;BLOCK;0;1.0. The rule sets the kind, proximity and damage.
• Unused groups are flagged for you. The log and /make_it_hot reload say "group $overworld is not used by any heatRules line, so it does nothing", and they name IDs that do not exist (typos such as minecraft:grass_black).
• Edit groups in-game: Mods → Make It Hot → Config → General → Heat Groups → Edit Groups... The editor has name, members and filters panes. Save validates everything; Cancel discards your changes. A yellow notice lists the groups no rule uses yet (Save stays allowed).
• Bad lines are logged with the reason and skipped; they never crash the game. Unknown IDs and absent mods simply match nothing, so optional compat lines are safe.

Biome and dimension control

• Whitelist or blacklist each rule or group with biomes=, notBiomes=, dimensions= and notDimensions=. These take IDs, biome tags such as #c:is_hot, whole mods or $groups.
• A blacklist always beats a whitelist. A rule's filters and its groups' filters must all pass.
• Biomes can be checked where you stand (ENTITY, the default) or where the hot thing is (SOURCE).
• locationModifiers (target;BIOME|DIMENSION;multiplier[;bonus]) make places hotter or cooler. They combine by multiplying, or by taking the strongest, and are clamped to a range you set. A bonus never creates heat where there is none.

Protection and danger

• Fire Resistance and fire-immune mobs are immune. Fire Protection, armor points and toughness reduce the heat, and armor wears down.
• Heatstroke causes no knockback and is not blocked by shields. Creative and spectator players are exempt.
• Death message: <player> died of heatstroke.
• Optional extras, all off by default: true per-tick damage, setting you on fire, mobs feeling the heat (with allow and deny lists), distance falloff and SUM stacking.

Operator commands (permission level 2 or the server console)

• /make_it_hot <setting> shows a value, and /make_it_hot <setting> <value> sets it.
• Values are validated with the same rules as the file, saved, and take effect immediately.
• /make_it_hot list shows every setting. /make_it_hot reload rebuilds the heat tables and reports rule problems.

Configuration

All 45 options are in config/makeithot-common.toml, NeoForge's ordinary local/common config, in 9 sections:

• General: rules, groups, proximity, damage, stacking
• Biomes and Dimensions
• Timing
• Damage: multiplier, cap, falloff, ignite
• Who Feels Heat: players, creative, mobs, allow and deny lists, peaceful
• Armor
• Effects: smoke, sizzle, warning message, tooltips
• Compat
• Performance

Every option has a long explanatory comment in the file, plus a translated label and a short tooltip in the config screen. On a dedicated server, the server's file decides all damage.

The higher the proximity, the greater the lag. To find heat, the mod checks every block in a cube around each affected player, so the cost grows with the cube of the radius. That is about 300 blocks at radius 3, 5,000 at 8, 290,000 at 32 and 2.2 million at 64. maxProximity (default 64) caps every rule. Skipping chunk sections with nothing hot in them, a per-scan block budget and longer scan intervals keep it manageable.

Radiation Compat (compat.radiationCompat, off by default). When it is on, the radiation shielding of the armor you wear also shields you from heat: heat × (1 − shielding × strength). It works with:

• Mekanism: the radiation shielding of worn armor such as the hazmat suit and MekaSuit.
• Nuclear Radiation: its armor protection values (X-ray, alpha, beta, neutron, average or max).

Neither mod is required. Make It Hot reads them only through reflection, and only when they are installed. If both are installed, the better shielding counts. As of 2026-11-09, neither mod has a 26.3 build, so this compat has only been tested against stand-ins that copy their published APIs.

The empty tags #makeithot:hot_blocks, #makeithot:hot_items and #makeithot:hot_fluids are ready for datapacks. The mod adds no blocks or items, so it has no creative tab or recipes. It sends no custom network packets: all logic runs on the server.

Bug reports, ideas and pack questions are welcome on the issue tracker. You can find more mods by kreezxil on CurseForge. Talk to use on Discord too.

Notes

• Requires Minecraft 26.3, NeoForge 26.3.0.101 or newer, and Java 25.
• Install it on the server and on every client. The client side provides the config screen, the "Hot!" tooltip and translations.
• The definition syntax is modelled on kreezxil's Coal Explosion.
• MIT License, © 2026 kreezxil.

Need a server? Use bisecthosting.com/kreezxil and run Make It Hot with your friends.