Swarmkeeper
Hero
Hmm,
1 in 20 chance per attack = 5%
3 attacks per round * 4 rounds = 12 attacks
12 * 5 = 60%
What am I missing?
Think about it this way... if the combat went 7 rounds, would there really be 105% chance of a crit? Ten rounds = 150% chance of a crit?
The actual probability of a crit in your example is: 1.00-(0.95^12) = what @DND_Reborn said