diff --git a/src/generated/resources/data/naturesaura/tags/blocks/nether_altar_wood.json b/src/generated/resources/data/naturesaura/tags/blocks/nether_altar_wood.json
new file mode 100644
index 00000000..4fec4854
--- /dev/null
+++ b/src/generated/resources/data/naturesaura/tags/blocks/nether_altar_wood.json
@@ -0,0 +1,7 @@
+{
+  "replace": false,
+  "values": [
+    "minecraft:crimson_planks",
+    "minecraft:warped_planks"
+  ]
+}
\ No newline at end of file
diff --git a/src/main/java/de/ellpeck/naturesaura/blocks/multi/Multiblocks.java b/src/main/java/de/ellpeck/naturesaura/blocks/multi/Multiblocks.java
index 34321134..6bf3deff 100644
--- a/src/main/java/de/ellpeck/naturesaura/blocks/multi/Multiblocks.java
+++ b/src/main/java/de/ellpeck/naturesaura/blocks/multi/Multiblocks.java
@@ -7,6 +7,7 @@ import de.ellpeck.naturesaura.api.multiblock.IMultiblock;
 import de.ellpeck.naturesaura.api.multiblock.Matcher;
 import de.ellpeck.naturesaura.blocks.BlockNatureAltar;
 import de.ellpeck.naturesaura.blocks.ModBlocks;
+import de.ellpeck.naturesaura.data.BlockTagProvider;
 import de.ellpeck.naturesaura.recipes.ModRecipes;
 import net.minecraft.block.Blocks;
 import net.minecraft.block.SaplingBlock;
@@ -36,7 +37,7 @@ public final class Multiblocks {
             ALTAR_PATTERN,
             'C', Blocks.RED_NETHER_BRICKS,
             'B', Blocks.NETHER_BRICKS,
-            'W', Blocks.CRIMSON_PLANKS,
+            'W', Matcher.tag(Blocks.CRIMSON_PLANKS, BlockTagProvider.NETHER_ALTAR_WOOD),
             'M', ModBlocks.GOLD_NETHER_BRICK,
             '0', ModBlocks.NATURE_ALTAR.getDefaultState().with(BlockNatureAltar.NETHER, true),
             ' ', Matcher.wildcard());
diff --git a/src/main/java/de/ellpeck/naturesaura/data/BlockTagProvider.java b/src/main/java/de/ellpeck/naturesaura/data/BlockTagProvider.java
index 83d66408..4f0531bc 100644
--- a/src/main/java/de/ellpeck/naturesaura/data/BlockTagProvider.java
+++ b/src/main/java/de/ellpeck/naturesaura/data/BlockTagProvider.java
@@ -1,12 +1,19 @@
 package de.ellpeck.naturesaura.data;
 
+import de.ellpeck.naturesaura.NaturesAura;
 import de.ellpeck.naturesaura.blocks.ModBlocks;
+import net.minecraft.block.Block;
+import net.minecraft.block.Blocks;
 import net.minecraft.data.BlockTagsProvider;
 import net.minecraft.data.DataGenerator;
 import net.minecraft.tags.BlockTags;
+import net.minecraft.util.ResourceLocation;
 import net.minecraftforge.common.Tags;
 
 public class BlockTagProvider extends BlockTagsProvider {
+
+    public static final Tags.IOptionalNamedTag<Block> NETHER_ALTAR_WOOD = BlockTags.createOptional(new ResourceLocation(NaturesAura.MOD_ID, "nether_altar_wood"));
+
     public BlockTagProvider(DataGenerator generatorIn) {
         super(generatorIn);
     }
@@ -21,5 +28,6 @@ public class BlockTagProvider extends BlockTagsProvider {
         this.getOrCreateBuilder(BlockTags.SLABS).add(ModBlocks.ANCIENT_SLAB, ModBlocks.INFUSED_SLAB, ModBlocks.INFUSED_BRICK_SLAB);
         this.getOrCreateBuilder(Tags.Blocks.DIRT).add(ModBlocks.NETHER_GRASS);
         this.getOrCreateBuilder(BlockTags.SMALL_FLOWERS).add(ModBlocks.END_FLOWER, ModBlocks.AURA_BLOOM);
+        this.getOrCreateBuilder(NETHER_ALTAR_WOOD).add(Blocks.CRIMSON_PLANKS, Blocks.WARPED_PLANKS);
     }
 }
diff --git a/src/main/resources/data/naturesaura/patchouli_books/book/en_us/entries/using/crimson_altar.json b/src/main/resources/data/naturesaura/patchouli_books/book/en_us/entries/using/crimson_altar.json
index 9b015901..c25751e5 100644
--- a/src/main/resources/data/naturesaura/patchouli_books/book/en_us/entries/using/crimson_altar.json
+++ b/src/main/resources/data/naturesaura/patchouli_books/book/en_us/entries/using/crimson_altar.json
@@ -17,7 +17,7 @@
         {
             "type": "multiblock",
             "multiblock_id": "naturesaura:nether_altar",
-            "text": "How to assemble the $(item)Crimson Altar$()"
+            "text": "How to assemble the $(item)Crimson Altar$(). The $(item)Crimson Planks$() can be replaced with $(item)Warped Planks$()."
         },
         {
             "type": "crafting",