Lifesteal
Heal your tower by the percent of lifesteal multiplied by damage dealt to the enemy on hit. Lifesteal works on any tower projectiles including from bounce or multishot. Orbs, Thorns, 
Ultimate Weapons and other abilities do not contribute to the Lifesteal.
Overall Lifesteal is a good early-mid game stat that will help with the survivability, but it gets less useful once enemy damage ramps up. Once enemies are able to oneshot the Tower it gets completely useless.
Since Lifesteal doesn't recover Recovery Package Health and hard to scale beyond it's initial workshop maximum of 4.46% it's usefulness falls off pretty fast, but at that stage of the game it's extremely cheap to max out in the Workshop.
The maximum lifesteal can be increased and decreased through trade-off perks.
Workshop[edit | edit source]
Unlocked in 
Workshop for 2000 coins after Thorn Damage. There are 80 levels with a base value of 0 and a max value of 4.46%.
| Level | Value | Cost | Total Cost |
|---|---|---|---|
| 1 | 0.10% | 60.00 | 0.00 |
| 2 | 0.20% | 86.00 | 146.00 |
| 3 | 0.29% | 119.00 | 265.00 |
| 4 | 0.39% | 162.00 | 427.00 |
| 5 | 0.48% | 215.00 | 642.00 |
| 6 | 0.57% | 279.00 | 921.00 |
| 7 | 0.67% | 356.00 | 1.28K |
| 8 | 0.75% | 445.00 | 1.72K |
| 9 | 0.84% | 547.00 | 2.27K |
| 10 | 0.93% | 663.00 | 2.93K |
| 11 | 1.02% | 793.00 | 3.73K |
| 12 | 1.10% | 937.00 | 4.66K |
| 13 | 1.18% | 1.10K | 5.76K |
| 14 | 1.26% | 1.27K | 7.03K |
| 15 | 1.34% | 1.46K | 8.49K |
| 16 | 1.42% | 1.67K | 10.16K |
| 17 | 1.50% | 1.89K | 12.05K |
| 18 | 1.58% | 2.13K | 14.18K |
| 19 | 1.65% | 2.38K | 16.56K |
| 20 | 1.73% | 2.66K | 19.21K |
| 21 | 1.80% | 2.95K | 22.16K |
| 22 | 1.87% | 3.25K | 25.41K |
| 23 | 1.94% | 3.58K | 28.99K |
| 24 | 2.01% | 3.92K | 32.91K |
| 25 | 2.08% | 4.28K | 37.19K |
| 26 | 2.15% | 4.66K | 41.85K |
| 27 | 2.22% | 5.06K | 46.90K |
| 28 | 2.28% | 5.47K | 52.38K |
| 29 | 2.35% | 5.91K | 58.28K |
| 30 | 2.41% | 6.36K | 64.65K |
| 31 | 2.47% | 6.84K | 71.48K |
| 32 | 2.53% | 7.33K | 78.82K |
| 33 | 2.59% | 7.84K | 86.66K |
| 34 | 2.65% | 8.38K | 95.04K |
| 35 | 2.71% | 8.93K | 103.97K |
| 36 | 2.77% | 9.50K | 113.47K |
| 37 | 2.82% | 10.10K | 123.57K |
| 38 | 2.88% | 10.71K | 134.28K |
| 39 | 2.93% | 11.35K | 145.62K |
| 40 | 2.99% | 12.00K | 157.62K |
| 41 | 3.04% | 12.68K | 170.30K |
| 42 | 3.09% | 13.37K | 183.67K |
| 43 | 3.14% | 14.09K | 197.76K |
| 44 | 3.19% | 14.83K | 212.59K |
| 45 | 3.24% | 15.59K | 228.19K |
| 46 | 3.29% | 16.38K | 244.56K |
| 47 | 3.33% | 17.18K | 261.74K |
| 48 | 3.38% | 18.01K | 279.75K |
| 49 | 3.43% | 18.86K | 298.61K |
| 50 | 3.47% | 19.73K | 318.33K |
| 51 | 3.51% | 21.24K | 339.57K |
| 52 | 3.56% | 22.18K | 361.75K |
| 53 | 3.60% | 23.15K | 384.90K |
| 54 | 3.64% | 24.14K | 409.04K |
| 55 | 3.68% | 25.15K | 434.19K |
| 56 | 3.72% | 26.19K | 460.37K |
| 57 | 3.76% | 27.25K | 487.62K |
| 58 | 3.80% | 28.33K | 515.95K |
| 59 | 3.83% | 29.44K | 545.39K |
| 60 | 3.87% | 30.57K | 575.96K |
| 61 | 3.91% | 31.73K | 607.68K |
| 62 | 3.94% | 32.90K | 640.58K |
| 63 | 3.98% | 34.11K | 674.69K |
| 64 | 4.01% | 35.34K | 710.03K |
| 65 | 4.04% | 36.59K | 746.62K |
| 66 | 4.08% | 37.87K | 784.49K |
| 67 | 4.11% | 39.17K | 823.66K |
| 68 | 4.14% | 40.50K | 864.16K |
| 69 | 4.17% | 41.85K | 906.01K |
| 70 | 4.20% | 43.23K | 949.24K |
| 71 | 4.23% | 44.63K | 993.87K |
| 72 | 4.26% | 46.06K | 1.04M |
| 73 | 4.28% | 47.51K | 1.09M |
| 74 | 4.31% | 48.99K | 1.14M |
| 75 | 4.34% | 50.50K | 1.19M |
| 76 | 4.36% | 54.63K | 1.24M |
| 77 | 4.39% | 56.26K | 1.30M |
| 78 | 4.41% | 57.92K | 1.36M |
| 79 | 4.44% | 59.61K | 1.42M |
| 80 | 4.46% | 61.32K | 1.48M |