Twine/src/main/java/com/thebrokenrail/twine/block/GlowingObsidianBlock.java

package com.thebrokenrail.twine.block;

import com.thebrokenrail.twine.util.ItemUtil;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.block.Block;
import net.minecraft.block.Material;
import net.minecraft.block.MaterialColor;
import net.minecraft.client.item.TooltipContext;
import net.minecraft.entity.Entity;
import net.minecraft.entity.LivingEntity;
import net.minecraft.entity.damage.DamageSource;
import net.minecraft.entity.mob.Monster;
import net.minecraft.item.ItemStack;
import net.minecraft.particle.ParticleTypes;
import net.minecraft.server.world.ServerWorld;
import net.minecraft.text.Text;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.BlockView;
import net.minecraft.world.World;

import java.util.List;

public class GlowingObsidianBlock extends Block {
    public GlowingObsidianBlock() {
        super(Settings.of(Material.STONE, MaterialColor.BLACK).requiresTool().strength(50.0F, 1200.0F).lightLevel(state -> 6).allowsSpawning((state, world, pos, type) -> false).emissiveLighting((state, world, pos) -> true));
    }

    @Override
    public void onSteppedOn(World world, BlockPos pos, Entity entity) {
        super.onSteppedOn(world, pos, entity);
        if (!world.isClient() && entity instanceof LivingEntity) {
            ((ServerWorld) world).spawnParticles(ParticleTypes.SMOKE, pos.getX() + 0.5d, pos.getY() + 1d, pos.getZ() + 0.5d, 3 + world.getRandom().nextInt(3), 0.2d, 0.5d, 0.2d,0.01d);
            if (entity.age % 10 == 0) {
                final float amount = 2f;
                if (entity instanceof Monster) {
                    ((LivingEntity) entity).heal(amount);
                } else {
                    entity.damage(DamageSource.MAGIC, amount);
                }
            }
        }
    }

    @Override
    @Environment(EnvType.CLIENT)
    public void buildTooltip(ItemStack stack, BlockView world, List<Text> tooltip, TooltipContext options) {
        super.buildTooltip(stack, world, tooltip, options);
        ItemUtil.addTooltip("block", "glowing_obsidian", 2, tooltip);
    }
}