 Cold Resistance Potion | Single-target buff | +50 cold res, 10m + 1m × Elixir Endurance rank |
 Cold Vulnerability | Single-target debuff | −1 800 cold res, 5m |
 Companion Spirit | Summon | summons 1x Bear |
 Cone of Cold | Frontal damage | spell power × (150% + 35% × (rank − 1)) cold dmg |
 Convoke Assistants | Summon monsters | summons 2x Forgotten Assistant (lv50, max 4) |
 Corrupted Breath | Frontal damage | spell power + 20 000 disease dmg |
 Crafting | Passive | craft equipment and items |
 Crafting Scroll | Passive | scribe scrolls |
 Crimson Bandages | Single-target buff | 2 000 hp/s, 5s |
 Crimson Berserker Pike | Single-target buff | +2% attack power, 30m |
 Crimson Harvest | Single-target damage | attack power + 1 200 physical dmg, 100% lifetap |
 Crimson Pact | Summon monsters | summons 1x Bloodfiend per player/mercenary (lv52, max 8) |
 Crippling Dust | Area debuff | root, −50% block, −25% rage/s, 15s |
 Crippling Refrain | Area debuff | Bard song (0.1% stronger per CHA), −20 × rank AC, 15s |
 Crippling Strike | Single-target debuff | −0.5% × rank attack power, 30s |
 Critical Pain | Single-target debuff | 25 × rank poison dmg/s (+150% of DEX), 10s |
 Crush Strike | Single-target damage | attack power + 1 physical dmg |
 Curse of the Depths | Area debuff | −100 AC, −100 all res, 270 cold dmg/s, 20% Cleanse Resist, 3m |
 Curse of Valorath | Single-target debuff | −1 speed, 1 000 disease dmg/s (+150% of DEX), 10% Cleanse Resist, 10s |
 Curseblight | Area debuff | 10 000 disease dmg/s, 50% Cleanse Resist, 30s |
