Relic
Assassin's Ambush Engine
Legendary
Effect
Heroes gain 30 Crit.
Whenever an 
Assassin auto attacks while Stealthed, they inflict Poison on their target equal to 75% of their Crit.
At start of combat, Assassins in the back 2 rows gain Stealth for 5 seconds and target the most threatening enemy.
Where it drops
- Auction House (Legendary Relics)
Other Legendary relics
Questions people ask
What does Assassin's Ambush Engine do in Guildrun?
Heroes gain 30 Crit. Whenever an Assassin auto attacks while Stealthed, they inflict Poison on their target equal to 75% of their Crit. At start of combat, Assassins in the back 2 rows gain Stealth for 5 seconds and target the most threatening enemy.
What is the difference between a relic and an item?
Items are equipped by a single hero and take up one of that hero's slots. Relics apply to the entire guild and do not use slots. That makes relics the stronger of the two when a build starts coming together.
How do I increase my team size?
Harmony Crystal raises it by one, up to five. So does each of the fifteen Mandate relics, but those require finishing an objective first, like dealing 15000 auto attack damage or applying 30000 shields. Pick the Mandate that matches what your team already does.