Improved Critical (Mythic)
Your critical strikes with your chosen weapon are deadlier than most.
Prerequisite: Improved Critical, base attack bonus +8.
Benefit: Your critical multiplier with your chosen weapon is increased by 1 (to a maximum of ×6).
Special: You can gain this feat multiple times. The effects do not stack. Each time you take this feat, it applies to a different non-mythic Improved Critical feat.
Source: Mythic Adventures, p. 66