The Ascension Keystone Quartus is a rare drop from the slayer monsters in the Monastery of Ascension. It is required to unlock the door to Legio Quartus's lair, so you or your slayer partner must have one before entering.
Dropping monsters
- For an exhaustive list of all known sources for this item, see here.
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| Source | Combat level | Quantity | Rarity |
|---|---|---|---|
| Rorarius | 120 | 1 | Rare |
| Gladius | 130 | 1 | Rare |
| Capsarius | 150 | 1 | Rare |
| Scutarius | 150 | 1 | Rare |
| Legio Primus | 175 | 1 | Rare |
| Legio Secundus | 175 | 1 | Rare |
| Legio Tertius | 175 | 1 | Rare |
| Legio Quartus | 175 | 1 | Rare |
| Legio Quintus | 175 | 1 | Rare |
| Legio Sextus | 175 | 1 | Rare |
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| Slayer creatures | |||||
| Legiones |
 Primus Secundus Tertius Quartus Quintus Sextus | ||||
| Keystones |
 Primus Secundus Tertius Quartus Quintus Sextus | ||||
| Signets |
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| Crossbow |
 Main-hand crossbow Off-hand crossbow Bolts Shard | ||||
| Miscellaneous |
 Ascension fragment Fragment arrows Fragment bolts History of the Order Order journal page Ocellus | ||||
| Money making |
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