2026/04/20 Update

Added a bunch of notes on various creatures or encounters.
Added some media for reference.

_notes_/Half-earth_spinewyrm.md

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+# Half-Earth Elemental Spinewyrm
+*Huge Magical Beast (Earth)*  
+**Challenge Rating:** 17
+
+---
+
+## Hit Dice
+**16d10+96** (184 hp)
+
+---
+
+## Initiative
++0
+
+---
+
+## Speed
+30 ft., burrow 20 ft.; **earth glide**
+
+---
+
+## Armor Class
+**29** (<28>2 size, +0 Dex, +21 natural)  
+Touch 8, flat-footed 29
+
+---
+
+## Base Attack / Grapple
++16 / +32
+
+---
+
+## Attack
+Bite +22 melee (2d8+12)
+
+---
+
+## Full Attack
+Bite +22 melee (2d8+12)  
+Tail slap +20 melee (2d6+6)
+
+---
+
+## Space / Reach
+15 ft. / 10 ft.
+
+---
+
+## Special Attacks
+
+**Poison Spines (Ex)**  
+Injury; Fort DC **26**; initial and secondary damage **1d6 Con**  
+DC = 10 + <20> HD (8) + Con modifier (8)
+
+**Spine Volley (Ex)**  
+As base spinewyrm; unchanged
+
+**Earth Mastery (Ex)**  
+The spinewyrm gains a +1 bonus on attack and damage rolls if both it and its opponent are touching the ground.
+
+---
+
+## Special Qualities
+
+- Darkvision 60 ft.  
+- Low-light vision  
+- Tremorsense 60 ft.  
+
+**Earth Glide (Su)**  
+The spinewyrm can move through stone, dirt, or earth as easily as a fish moves through water. It leaves no tunnel or trace.
+
+**Damage Reduction:** 10/adamantine  
+
+**Elemental Immunities:**  
+Immune to sleep, paralysis, and poison effects
+
+**Acid Resistance:** 20
+
+---
+
+## Saves
+- Fort +18  
+- Ref +10  
+- Will +7  
+
+---
+
+## Abilities
+
+| Ability | Score |
+|-------|------:|
+| Strength | 33 |
+| Dexterity | 10 |
+| Constitution | 27 |
+| Intelligence | 2 |
+| Wisdom | 12 |
+| Charisma | 6 |
+
+---
+
+## Skills
+Listen +19, Spot +19, Survival +17
+
+---
+
+## Feats
+Power Attack  
+Improved Natural Attack (bite)  
+Multiattack  
+Weapon Focus (bite)  
+Awesome Blow  
+Improved Bull Rush  
+
+---
+
+## Environment
+Warm deserts, rocky badlands, silt margins
+
+---
+
+## Organization
+Solitary
+
+---
+
+## Alignment
+Always neutral
+
+---
+
+## Advancement
+None (maximum Hit Dice reached)