Upgrading the Christmas Icicle Shield grants additional Speed Movement Effect
| Grade | Bonus |
| +1 | N/A |
| +2 | N/A |
| +3 | N/A |
| +4 | N/A |
| +5 | N/A |
| +6 | Speed+2% |
| +7 | Speed+4% |
| +8 | Speed+6% |
| +9 | Speed+8% |
| +10 | Speed+10% |
The base and the bonus from upgrading it will net you Speed+20% in total.
