Thin Skeletal Structure
| Rank | Effect | Flavor |
| 1 | +2 DEX, +25 Stealth | You have a somewhat thin skeletal structure. |
| 2 | +4 DEX, +50 Stealth | You have a moderately thin skeletal structure. |
| 3 | +6 DEX, +75 Stealth | You have an unnaturally thin skeletal structure. |
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In earlier versions of Crawl, this mutation also reduced strength by 1 per rank. | ||
