diff --git a/.gitignore b/.gitignore
index 1b6612c..5822946 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,5 @@ src/public/static/
 import_files/
 test_reports/
 dashboard_templates/backup_*.zip
+
+.hypothesis
diff --git a/poetry.lock b/poetry.lock
index 6dc6cd2..fb60979 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -313,6 +313,35 @@ category = "main"
 optional = false
 python-versions = ">=3.7"
 
+[[package]]
+name = "hypothesis"
+version = "6.56.4"
+description = "A library for property-based testing"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+attrs = ">=19.2.0"
+exceptiongroup = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
+sortedcontainers = ">=2.1.0,<3.0.0"
+
+[package.extras]
+all = ["backports.zoneinfo (>=0.2.1)", "black (>=19.10b0)", "click (>=7.0)", "django (>=3.2)", "dpcontracts (>=0.4)", "importlib-metadata (>=3.6)", "lark-parser (>=0.6.5)", "libcst (>=0.3.16)", "numpy (>=1.9.0)", "pandas (>=1.0)", "pytest (>=4.6)", "python-dateutil (>=1.4)", "pytz (>=2014.1)", "redis (>=3.0.0)", "rich (>=9.0.0)", "tzdata (>=2022.5)"]
+cli = ["black (>=19.10b0)", "click (>=7.0)", "rich (>=9.0.0)"]
+codemods = ["libcst (>=0.3.16)"]
+dateutil = ["python-dateutil (>=1.4)"]
+django = ["django (>=3.2)"]
+dpcontracts = ["dpcontracts (>=0.4)"]
+ghostwriter = ["black (>=19.10b0)"]
+lark = ["lark-parser (>=0.6.5)"]
+numpy = ["numpy (>=1.9.0)"]
+pandas = ["pandas (>=1.0)"]
+pytest = ["pytest (>=4.6)"]
+pytz = ["pytz (>=2014.1)"]
+redis = ["redis (>=3.0.0)"]
+zoneinfo = ["backports.zoneinfo (>=0.2.1)", "tzdata (>=2022.5)"]
+
 [[package]]
 name = "identify"
 version = "2.5.8"
@@ -865,7 +894,7 @@ h11 = ">=0.9.0,<1"
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.10.0, <4"
-content-hash = "d566d58d59e11f9bc96abc0c53cc8b00b8b5d6b1c886b82570cc0fb1cdc158fd"
+content-hash = "0dc2fab20f892efa2b0acbddd23ae1378d5c5ae24ece6357f11858c625cced68"
 
 [metadata.files]
 ansicon = [
@@ -1187,6 +1216,10 @@ h11 = [
     {file = "h11-0.14.0-py3-none-any.whl", hash = "sha256:e3fe4ac4b851c468cc8363d500db52c2ead036020723024a109d37346efaa761"},
     {file = "h11-0.14.0.tar.gz", hash = "sha256:8f19fbbe99e72420ff35c00b27a34cb9937e902a8b810e2c88300c6f0a3b699d"},
 ]
+hypothesis = [
+    {file = "hypothesis-6.56.4-py3-none-any.whl", hash = "sha256:67950103ee930c66673494b3671474a083ea71f1ebe8f0ff849ba8ad5317772d"},
+    {file = "hypothesis-6.56.4.tar.gz", hash = "sha256:313bc1c0f377ec6c98815d3237a69add7558eadee4effe4ed613d0ba36513a52"},
+]
 identify = [
     {file = "identify-2.5.8-py2.py3-none-any.whl", hash = "sha256:48b7925fe122720088aeb7a6c34f17b27e706b72c61070f27fe3789094233440"},
     {file = "identify-2.5.8.tar.gz", hash = "sha256:7a214a10313b9489a0d61467db2856ae8d0b8306fc923e03a9effa53d8aedc58"},
diff --git a/pyproject.toml b/pyproject.toml
index 4df59b8..64c4497 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,6 +32,7 @@ freezegun = ">=1.1.0"
 bpython = ">=0.22.1"
 poetry-deps-scanner = ">=2.0.0"
 invoke = ">=1.7.3"
+hypothesis = ">=6.56.4"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
diff --git a/src/character/models/character.py b/src/character/models/character.py
index d7f58d3..c0f3290 100644
--- a/src/character/models/character.py
+++ b/src/character/models/character.py
@@ -155,6 +155,7 @@ class Character(models.Model):
             Profile.MagicalStrength.INTELLIGENCE: self.modifier_intelligence,
             Profile.MagicalStrength.WISDOM: self.modifier_wisdom,
             Profile.MagicalStrength.CHARISMA: self.modifier_charisma,
+            Profile.MagicalStrength.NONE: 0,
         }
 
         return self.level + modifier_map.get(
diff --git a/src/character/tests/test_character.py b/src/character/tests/test_character.py
new file mode 100644
index 0000000..0ce5637
--- /dev/null
+++ b/src/character/tests/test_character.py
@@ -0,0 +1,86 @@
+import pytest
+from hypothesis import given
+from hypothesis.strategies import integers
+
+from character.models.character import Character
+from character.tests.utils import ability_values, levels, modifier_test
+
+
+@pytest.mark.parametrize(
+    "value,expected",
+    [
+        (1, -4),
+        (2, -4),
+        (3, -4),
+        (4, -3),
+        (5, -3),
+        (6, -2),
+        (7, -2),
+        (8, -1),
+        (9, -1),
+        (10, 0),
+        (11, 0),
+        (12, 1),
+        (13, 1),
+        (14, 2),
+        (15, 2),
+        (16, 3),
+        (17, 3),
+        (18, 4),
+        (19, 4),
+        (20, 5),
+        (21, 5),
+    ],
+)
+@pytest.mark.parametrize(
+    "ability",
+    ["strength", "dexterity", "constitution", "intelligence", "wisdom", "charisma"],
+)
+def test_modifier_values(value, expected, ability):
+    character = Character()
+    value_attribute = f"value_{ability}"
+    setattr(character, value_attribute, value)
+    modifier_attribute = f"modifier_{ability}"
+    assert getattr(character, modifier_attribute) == expected
+
+
+@given(ability_values())
+def test_initiative(dex):
+    assert Character(value_dexterity=dex).initiative == dex
+
+
+@given(level=levels(), strength=ability_values())
+def test_attack_melee(level, strength):
+    character = Character(level=level, value_strength=strength)
+    assert character.attack_melee == level + modifier_test(strength)
+
+
+@given(level=levels(), dexterity=ability_values())
+def test_attack_range(level, dexterity):
+    character = Character(level=level, value_dexterity=dexterity)
+    assert character.attack_range == level + modifier_test(dexterity)
+
+
+@given(armor=integers(), shield=integers(), dexterity=ability_values(), misc=integers())
+def test_defense(armor, shield, dexterity, misc):
+    char = Character(
+        armor=armor, shield=shield, value_dexterity=dexterity, defense_misc=misc
+    )
+    assert char.defense == 10 + armor + shield + modifier_test(dexterity) + misc
+
+
+@given(level=levels(), intelligence=ability_values())
+def test_mana_max(level, intelligence):
+    char = Character(level=level, value_intelligence=intelligence)
+    assert char.mana_max == 2 * level + modifier_test(intelligence)
+
+
+@given(
+    level=levels(), intelligence=ability_values(), mana_consumed=integers(min_value=0)
+)
+def test_mana_remaining(level, intelligence, mana_consumed):
+    char = Character(
+        level=level, value_intelligence=intelligence, mana_consumed=mana_consumed
+    )
+    mana_max = 2 * level + modifier_test(intelligence)
+    assert char.mana_remaining == mana_max - mana_consumed
diff --git a/src/character/tests/utils.py b/src/character/tests/utils.py
new file mode 100644
index 0000000..ce97503
--- /dev/null
+++ b/src/character/tests/utils.py
@@ -0,0 +1,35 @@
+from functools import partial
+
+from hypothesis.strategies import integers
+
+VALUE_TO_MODIFIER = {
+    1: -4,
+    2: -4,
+    3: -4,
+    4: -3,
+    5: -3,
+    6: -2,
+    7: -2,
+    8: -1,
+    9: -1,
+    10: 0,
+    11: 0,
+    12: 1,
+    13: 1,
+    14: 2,
+    15: 2,
+    16: 3,
+    17: 3,
+    18: 4,
+    19: 4,
+    20: 5,
+    21: 5,
+}
+
+
+def modifier_test(value: int) -> int:
+    return VALUE_TO_MODIFIER[value]
+
+
+ability_values = partial(integers, min_value=1, max_value=21)
+levels = partial(integers, min_value=1)