====== Arcana (Int) ======
An arcana check is used when your technical skill or knowledge of spellcasting is needed.

^ Task                                                          ^  Arcana DC                                        ^
| Identify a spell as it is being cast                          | 15 + spell level                                  |
| Learn a spell from a spellbook or scroll                      | 15 + spell level                                  |
| Prepare a spell from a borrowed spellbook                     | 15 + spell level                                  |
| Cast defensively (avoiding an attack of opportunity)          | 15 + double spell level                           |
| Cast a spell if you are damaged while casting                 | 10 + damage dealt + spell level                   |
| Cast a spell if you are taking continuous damage              | 10 + half damage dealt + spell level              |
| Cast a spell if you are distracted by a non-damaging spell    | Distracting spell's DC + spell level              |
| Cast a spell while on a moving mount or vehicle               | 10 + spell level                                  |
| Cast a spell while on a vigorously moving mount or vehicle    | 15 + spell level                                  |
| Cast a spell while moving violently (earthquake, falling etc.)| 20 + spell level                                  |
| Cast a spell while entangled                                  | 15 + spell level                                  |
| Cast a spell while grappled                                   | 10 + Opponent's CMB + spell level                 |
| Cast a spell in high wind                                     | 5 + spell level                                   |
| Cast a spell in extreme weather                               | 10 + spell level                                  |