To charge “fast in 6 tile” or “slow in 9 tile”, it need at least 33.333% total mana regen bonus.
It is surely possible for “4% mana node” case. With “max Magic/Styx troop”, “5% costume bonus”, “Bard family” and “4% mana node”, they give total 20%+5%+5%+4% = 34% mana regen.
But there is a problem for “2% mana node” case.
- If all those mana bonus stack additively, they give total 20%+5%+5%+2% = 32% mana regen which isn’t enough.
- If all those mana bonus stack multiply, they give total 1.2 x 1.05 x 1.05 x 1.02 = +34.946% mana regen which is enough.
If we assume that “mana bonus” is similar to “defense bonus”, they all will stack multiply.
I don’t know if all of them stack additively or multiply. I need someone who have “max level magic troop” to test this.