Core is the epic boss of Cruma Tower. It sits in a sealed room on the 3rd floor, guarded by 17 minions. It first appears in Chronicle 9 (The Art of Mammon). Before that, the room is empty.
After a kill, Core comes back about 36 to 48 hours later, always between 20:30 and 21:30 (server time), at a random minute. It stays until someone kills it. The raid boss list in the Community Board shows the earliest time it can appear.
Core's weaknesses
| Weak to | Effect |
|---|---|
| Daggers and bows | Core takes 25% more damage from dagger and bow attacks. |
| Magic | Its physical defence is about three times its magic defence, so magic gets through more easily. |
| Magic Creature bonuses | Core is a Magic Creature, so bonuses against Magic Creatures work on it. For example,  Eye of Slayer (Duelist, Dreadnought) gives +40% damage. |
Core has no element. No attribute does more or less damage to it.
What Core resists
Core has 90% resistance to stun, sleep, root, paralysis and fear. These almost never land, so do not waste them. Its minions have the same resistance.
The minions
Core keeps 17 minions, all level 80 and aggressive. They attack anyone who comes close.
| Minion | Count | How it fights | Weak to |
|---|---|---|---|
| Death Knight | 10 | Melee, deals Dark damage | Holy attacks; skills against undead |
| Death Wraith | 3 | Melee and Wind Strike (Wind magic); melee deals Dark damage | Holy attacks; skills against undead |
| Susceptor | 4 | Melee and Wind Strike (Wind magic) | Magic Creature bonuses, such as Eye of Slayer |
Death Knights and Death Wraiths are undead. Dark resistance helps against their hits. Wind resistance helps against Wind Strike from Death Wraiths and Susceptors.
Notable drops
The loot goes to the party that dealt the most damage.
| Item | Amount | Chance |
|---|---|---|
 Ring of Core | 1 | 30% |
 High-Grade Life Stone: level 52 | 2 - 4 | 75% |
 Top-Grade Life Stone: level 49 | 1 | 14.3% |
| High-Grade Life Stone: level 49 | 1 | 25% |
| Top-Grade Life Stone: level 52 | 1 | 14.3% |
 Scroll: Enchant Weapon (C) | 1 | 14% |
Core also drops Adena and one random weapon or armour piece on every kill.