diff --git a/libs/gw2_evtc_parser/src/gw2_evtc_parser/parser.py b/libs/gw2_evtc_parser/src/gw2_evtc_parser/parser.py
index fe41d8c2..6f4c65df 100644
--- a/libs/gw2_evtc_parser/src/gw2_evtc_parser/parser.py
+++ b/libs/gw2_evtc_parser/src/gw2_evtc_parser/parser.py
@@ -1201,6 +1201,9 @@ def parse_events(source: BinaryIO | bytes) -> Iterator[Event]:  # noqa: PLR0912,
                 if _iff not in {1, 2} and not is_self_condi_tick:
                     continue
                 if _ev_buff:
+                    # Raw source-less condition ticks with UNKNOWN iff and a master are uncredited.
+                    if _iff == 2 and event_src_agent == 0 and src_master_inst != 0:
+                        continue
                     magnitude = 0 if buff_dmg >= _DAMAGE_SANITY_CAP else max(0, buff_dmg)
                     condition_damage = magnitude
                     is_attempt = magnitude > 0 or _result != 0
diff --git a/libs/gw2_evtc_parser/tests/test_parser_emit_buff.py b/libs/gw2_evtc_parser/tests/test_parser_emit_buff.py
index 08c35fa4..868eeefe 100644
--- a/libs/gw2_evtc_parser/tests/test_parser_emit_buff.py
+++ b/libs/gw2_evtc_parser/tests/test_parser_emit_buff.py
@@ -1115,6 +1115,31 @@ def test_parse_events_2025_keeps_unknown_iff_damage() -> None:
     assert events[0].iff == 2
 
 
+def test_parse_events_2025_drops_unknown_iff_uncredited_master_condition_damage() -> None:
+    evtc = _build_minimal_evtc(
+        [(1, 1, 1, "Src", True), (2, 1, 1, "Target", False)],
+        build="20260618",
+        skills=[(723, "Bleeding")],
+        events=[
+            _build_event_record_2025(
+                time_ms=10_000,
+                src_agent=0,
+                dst_agent=2,
+                value=0,
+                buff_dmg=33,
+                skill_id=723,
+                iff=2,
+                buff=1,
+                result=14,
+                src_instid=2437,
+                src_master_instid=1452,
+            ),
+        ],
+    )
+
+    assert list(PythonEvtcParser().parse_events(evtc)) == []
+
+
 def test_parse_events_2025_keeps_statechange_on_minion_actor() -> None:
     evtc = _build_minimal_evtc(
         [(1, 1, 1, "Owner", True), (2, 1, 1, "Minion", False)],