The Ascension Keystone Primus is a rare drop from the slayer monsters in the Monastery of Ascension. It is required to unlock the door to Legio Primus'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 |
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