Piranha

	Classic	Expert	Master	Legendary (For the Worthy)
Life	30	60	90	120
Attack	25	50	75	133
Defense	2	2	2	2
Knockback Taken	100% (High)	90% (High)	80% (High)	80% (High)
Coins	50	125	125	175

The last column is Master mode in a world made with the For the Worthy seed. Its numbers were measured in the game, not computed here.

For one player in a world before Hardmode. Expert and Master scale life, attack, knockback and coins by the game's own multipliers.

Coins: each kill rolls the coins from 80% to 175% of this value, then rarer extra rolls can add more.

In a Hardmode world

On Expert and Master, a Hardmode world raises weak enemies: when attack plus defense plus a quarter of life is under 80 (100 after Plantera), the game multiplies them up.

	Life	Attack	Defense	Knockback Taken	Coins
Expert, In Hardmode	132	90	4	90% (High)	2
Master, In Hardmode	198	135	4	80% (High)	2
Expert, After Plantera	132	90	4	90% (High)	2
Master, After Plantera	198	135	4	80% (High)	2

Classic

Item	Quantity	Chance	Kills for 50%	Kills for 90%	Conditions
Hook	1	83/2,500 (3.32%)	21	69	Rolled only when the roll for Robot Hat (1 in 250) fails
Compass	1	1/75 (1.33%)	52	172
Robot Hat	1	1/250 (0.4%)	173	575

Expert

Item	Quantity	Chance	Kills for 50%	Kills for 90%	Conditions
Hook	1	83/2,500 (3.32%)	21	69	Rolled only when the roll for Robot Hat (1 in 250) fails
Compass	1	1/75 (1.33%)	52	172
Robot Hat	1	1/250 (0.4%)	173	575

Master

Item	Quantity	Chance	Kills for 50%	Kills for 90%	Conditions
Hook	1	83/2,500 (3.32%)	21	69	Rolled only when the roll for Robot Hat (1 in 250) fails
Compass	1	1/75 (1.33%)	52	172
Robot Hat	1	1/250 (0.4%)	173	575

Chance is per kill. Kills for 50% and 90% is how many kills give that chance to see the item at least once.