add new monsters, spells, and rules

src/pages/spells/improved-invisibility.md

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+---
+title: Improved Invisibility
+description: The Improved Invisibility spell for OSR gaming.
+date_pub: 2023-10-27T22:22:24.000-04:00
+section: spells
+content_type: feature
+short_code: s11
+tags: arcane
+---
+
+<div class='headlessTableWrapper'>
+
+|              |                       |
+| ------------ | --------------------- |
+| **Level**    | 4                     |
+| **Duration** | 4 rounds +1 per level |
+| **Range**    | Self or touch         |
+
+</div>
+
+Caster or creature touched becomes invisible.
+
+-   Any clothing or gear carried by a target creature is also rendered invisible while carried.
+-   Target can attack while invisible.
+-   Casting a spell while invisible breaks invisibility.
+-   Invisible creatures get +4 to AC and saving throws against opponents who are aware of them, but can't see them.
+-   Invisible light sources still cast light.

src/pages/spells/suggestion.md

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+---
+title: Suggestion
+description: The Suggestion spell for OSR gaming.
+date_pub: 2023-10-27T22:33:41.000-04:00
+section: spells
+content_type: feature
+short_code: ssu
+tags: arcane
+---
+
+<div class='headlessTableWrapper'>
+
+|              |                              |
+| ------------ | ---------------------------- |
+| **Level**    | 3                            |
+| **Duration** | 4 turns + 4 per caster level |
+| **Range**    | 30'                          |
+
+</div>
+
+Caster makes a suggestion that influences the behavior of target intelligent creature.
+
+-   Must take the form of a short phrase (1-2 sentences at most) that suggests a course of action to the target.
+-   Suggestion must be in a language understood by the target.
+-   Suggestions which are obviously harmful to the target cause the spell to fail.
+-   Unwilling targets may **Save vs Spells** to ignore the suggestion.
+    -   Saves vs suggestions that sound very reasonable get -2.
+-   Undead are immune.