diff --git a/src/BrutalPeeps.hh b/src/BrutalPeeps.hh
new file mode 100644
index 00000000..02ead8b5
--- /dev/null
+++ b/src/BrutalPeeps.hh
@@ -0,0 +1,45 @@
+#pragma once
+
+#include <array>
+#include <cstdint>
+
+struct BrutalPeepsTierDefinition {
+  int8_t tier;
+  uint32_t required_level;
+  float exp_multiplier;
+  float enemy_hp_multiplier;
+  double rare_drop_multiplier;
+};
+
+static constexpr std::array<BrutalPeepsTierDefinition, 11> BRUTAL_PEEPS_TIERS = {{
+    {1, 100, 1.5f, 1.5f, 1.001},
+    {2, 110, 1.7f, 1.7f, 1.002},
+    {3, 120, 2.0f, 2.0f, 1.005},
+    {4, 130, 2.2f, 2.2f, 1.006},
+    {5, 140, 2.5f, 2.5f, 1.008},
+    {6, 150, 2.7f, 2.7f, 1.009},
+    {7, 160, 3.0f, 3.0f, 1.010},
+    {8, 170, 4.0f, 3.5f, 1.020},
+    {9, 180, 5.0f, 4.0f, 1.030},
+    {10, 190, 6.0f, 4.5f, 1.040},
+    {11, 200, 1.0f, 5.0f, 1.050},
+}};
+
+static inline const BrutalPeepsTierDefinition* brutal_peeps_tier_definition(int64_t tier) {
+  for (const auto& def : BRUTAL_PEEPS_TIERS) {
+    if (def.tier == tier) {
+      return &def;
+    }
+  }
+  return nullptr;
+}
+
+static inline int8_t max_brutal_peeps_tier_for_level(uint32_t level) {
+  int8_t ret = -1;
+  for (const auto& def : BRUTAL_PEEPS_TIERS) {
+    if (level >= def.required_level) {
+      ret = def.tier;
+    }
+  }
+  return ret;
+}