TESTED: Sabretooth never gets 6 charges.
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I was skeptical that Sabretooth ever got 6 charges (the info says it's random between 3 and 6) so I tested it with a combo of first time uses of the champ and what happens after you start a fight later in a quest with zero charges. This is what I got out of 32 tests.
Note I never once pulled 6 - which is basically statistically impossible for 32 rolls of a 4 sided die. And you are way more likely to get a 3 or 4 than a 5.
Is this a bug?