diff --git a/src/dnd.py b/src/dnd.py
index 659ff7e..c8a0241 100644
--- a/src/dnd.py
+++ b/src/dnd.py
@@ -168,7 +168,11 @@ class DnDCharacter:
         return self.base_ac + self.armor_bonus + self.shield_bonus
     
     def _calc_prof_bonus(self) -> int:
-        return 2 + ((self.level - 1) // 4)
+        # D&D 5e: +2 (1-4), +3 (5-8), +4 (9-12), +5 (13-16), +6 (17-20)
+        # Beyond 20: +6 + (level-20)//4
+        if self.level <= 20:
+            return 2 + ((self.level - 1) // 4)
+        return 6 + ((self.level - 20) // 4)
     
     def _calc_spell_slots(self) -> int:
         if self.dnd_class in ("Magier", "Hexenmeister", "Barde", "Kleriker", "Druide"):
@@ -439,11 +443,14 @@ class DnDCharacter:
     
     @property
     def xp_to_next(self) -> int:
-        """D&D 5e XP thresholds."""
-        thresholds = [0, 300, 900, 2700, 6500, 14000, 23000, 34000, 48000, 64000, 85000, 100000, 120000, 140000, 165000, 195000, 225000, 265000, 305000, 355000]
+        """XP für nächstes Level. D&D 5e bis Level 20, danach polynomial."""
+        thresholds = [0, 300, 900, 2700, 6500, 14000, 23000, 34000, 48000, 64000, 
+                      85000, 100000, 120000, 140000, 165000, 195000, 225000, 265000, 305000, 355000]
         if self.level < len(thresholds):
             return thresholds[self.level]
-        return 999999
+        # Beyond level 20: quadratic scaling — steady growth, no explosion
+        # Formula: 355000 + (level-20)^2 * 50000
+        return int(355000 + ((self.level - 20) ** 2) * 50000)
     
     def saving_throw(self, ability: str) -> dict:
         """Saving Throw: d20 + ability mod + prof (if proficient)."""