How do the Attack Boost bonuses from Foods and Elixirs work?
So I just tested this using the method suggested by @Seiyria.
These following results are gathered while wearing the Champions Tunic, and using each tier of food against the same enemy at full health.
+--------------------+----------+----+----+----+
| Weapon | Standard | T1 | T2 | T3 |
+--------------------+----------+----+----+----+
| Torch | 2 | 2 | 2 | 3 |
| Woodcutters Axe | 3 | 3 | 3 | 4 |
| Throwing Spear | 6 | 7 | 7 | 9 |
| Iron Sledgehammer | 12 | 14 | 15 | 18 |
| Guardian Sword | 20 | 24 | 26 | 30 |
| Knights Broadsword | 26 | 31 | 33 | 39 |
| Guardian Sword+ | 30 | 36 | 39 | 45 |
| Guardian Sword++ | 40 | 48 | 52 | 60 |
| Ancient Battleaxe++| 60 | 72 | 78 | 90 |
+--------------------+----------+----+----+----+
As indicated by this data, the Percentual Increases are:
- Tier 1 - 20%
- Tier 2 - 30%
- Tier 3 - 50%
(after rounding)