Just so you know the -6 to -150 was a format change during a rewrite of the spell system in 2002.
From all the research I have seen, -6 represented the equivalent of -25 resist per, meaning that -6 would have been -150 resist mod before the formatting change.
This is the data directly from the Velious client CD on my shelf compared to P99.
789^Dragon Roar^PLAYER_1^^^ lets loose a mighty roar.^You flee in terror.^^You are no longer afraid.^0^300^0^0^0^0^36000^7^3^0^0^-6^1^0^0^0^0^0^0^0^0^0^0^400^0^0^0^0^0^0^0^0^0^0^0^25 07^2116^-1^-1^-1^-1^1^1^1^1^-1^-1^100^100^100^100^100^100^100^100^100^100^100^100^ 0^0^0^1^10^23^254^254^254^254^254^254^254^254^254^ 254^4^0^52^-1^0^0^61^61^61^61^61^61^61^61^61^61^61^61^61^61^61 ^43^13^0^13^0^0^0^0^0^0^0^0^0^0^0^0^0^0^0^0^0^0^10 0^0^154^0
789^Dragon Roar^PLAYER_1^^^ lets loose a mighty roar.^You flee in terror.^^You are no longer afraid.^0^300^0^0^0^0^36000^7^3^0^0^0^1^0^0^0^0^0^ 0^0^0^0^0^400^0^0^0^0^0^0^0^0^0^0^0^2507^2116^-1^-1^-1^-1^1^1^1^1^-1^-1^-1^-1^100^100^100^100^100^100^100^100^100^100^100^100^ 0^0^0^1^10^23^254^254^254^254^254^254^254^254^254^ 254^4^0^52^-1^0^0^255^255^255^255^255^255^255^255^255^255^255^ 255^255^255^255^43^13^0^13^0^0^0^0^0^0^0^0^0^0^0^0 ^0^0^0^0^0^0^100^0^154^101^0^-150^0^0^0^0^0^0^0^0^^^^0^0^0^0^0^0^0
-6 (x25) before the change == -150 after the change.
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