diff --git a/src/server/scripts/Outland/CoilfangReservoir/SerpentShrine/boss_hydross_the_unstable.cpp b/src/server/scripts/Outland/CoilfangReservoir/SerpentShrine/boss_hydross_the_unstable.cpp
index c2bbfeaec..1423cc949 100644
--- a/src/server/scripts/Outland/CoilfangReservoir/SerpentShrine/boss_hydross_the_unstable.cpp
+++ b/src/server/scripts/Outland/CoilfangReservoir/SerpentShrine/boss_hydross_the_unstable.cpp
@@ -145,24 +145,25 @@ struct boss_hydross_the_unstable : public BossAI
             me->ApplySpellImmune(0, IMMUNITY_SCHOOL, SPELL_SCHOOL_MASK_NATURE, true);
             DoCastSelf(SPELL_CORRUPTION, true);
 
-            scheduler.Schedule(0s, GROUP_ABILITIES, [this](TaskContext)
+            scheduler.Schedule(15s, GROUP_ABILITIES, [this](TaskContext)
             {
                 DoCastSelf(SPELL_MARK_OF_CORRUPTION1);
-            }).Schedule(15s, GROUP_ABILITIES, [this](TaskContext)
-            {
-                DoCastSelf(SPELL_MARK_OF_CORRUPTION2);
             }).Schedule(30s, GROUP_ABILITIES, [this](TaskContext)
             {
-                DoCastSelf(SPELL_MARK_OF_CORRUPTION3);
+                DoCastSelf(SPELL_MARK_OF_CORRUPTION2);
             }).Schedule(45s, GROUP_ABILITIES, [this](TaskContext)
             {
-                DoCastSelf(SPELL_MARK_OF_CORRUPTION4);
+                DoCastSelf(SPELL_MARK_OF_CORRUPTION3);
             }).Schedule(60s, GROUP_ABILITIES, [this](TaskContext)
             {
-                DoCastSelf(SPELL_MARK_OF_CORRUPTION5);
+                DoCastSelf(SPELL_MARK_OF_CORRUPTION4);
             }).Schedule(75s, GROUP_ABILITIES, [this](TaskContext)
+            {
+                DoCastSelf(SPELL_MARK_OF_CORRUPTION5);
+            }).Schedule(90s, GROUP_ABILITIES, [this](TaskContext context)
             {
                 DoCastSelf(SPELL_MARK_OF_CORRUPTION6);
+                context.Repeat(15s);
             }).Schedule(12150ms, GROUP_ABILITIES, [this](TaskContext context)
             {
                 DoCastRandomTarget(SPELL_VILE_SLUDGE, 0, 0.0f, true, true);
@@ -176,24 +177,25 @@ struct boss_hydross_the_unstable : public BossAI
             me->ApplySpellImmune(0, IMMUNITY_SCHOOL, SPELL_SCHOOL_MASK_NATURE, false);
             me->RemoveAurasDueToSpell(SPELL_CORRUPTION);
 
-            scheduler.Schedule(0s, GROUP_ABILITIES, [this](TaskContext)
+            scheduler.Schedule(15s, GROUP_ABILITIES, [this](TaskContext)
             {
                 DoCastSelf(SPELL_MARK_OF_HYDROSS1);
-            }).Schedule(15s, GROUP_ABILITIES, [this](TaskContext)
-            {
-                DoCastSelf(SPELL_MARK_OF_HYDROSS2);
             }).Schedule(30s, GROUP_ABILITIES, [this](TaskContext)
             {
-                DoCastSelf(SPELL_MARK_OF_HYDROSS3);
+                DoCastSelf(SPELL_MARK_OF_HYDROSS2);
             }).Schedule(45s, GROUP_ABILITIES, [this](TaskContext)
             {
-                DoCastSelf(SPELL_MARK_OF_HYDROSS4);
+                DoCastSelf(SPELL_MARK_OF_HYDROSS3);
             }).Schedule(60s, GROUP_ABILITIES, [this](TaskContext)
             {
-                DoCastSelf(SPELL_MARK_OF_HYDROSS5);
+                DoCastSelf(SPELL_MARK_OF_HYDROSS4);
             }).Schedule(75s, GROUP_ABILITIES, [this](TaskContext)
+            {
+                DoCastSelf(SPELL_MARK_OF_HYDROSS5);
+            }).Schedule(90s, GROUP_ABILITIES, [this](TaskContext context)
             {
                 DoCastSelf(SPELL_MARK_OF_HYDROSS6);
+                context.Repeat(15s);
             }).Schedule(12150ms, GROUP_ABILITIES, [this](TaskContext context)
             {
                 DoCastRandomTarget(SPELL_WATER_TOMB, 0, 0.0f, true, true);