Elf slowing spell works incorrectly?

[houdou]

I'm playing undead. When the slowing spell is used on the fire thrower pegasus and other units, it slows them down to zero, even though it states "speed-1" in the effect description of the affected unit. The speed itself is shown as 6-6.

Furthermore, removing the spell does not restore the speed.

The elves have very likely all techs developed.

[Sunrise Samurai]

Known bug, unfortunately.

[Stratego (dev)]

why is this bug? do we know it?
@makazuwr32 ?

[makazuwr32]

There are few spells which are bugged.
Unfortunately we do not have savra who knows how do they work though this i can't say what is happening there yet.

[Kronox]

The geodryf earth wrath causes permanent -2 speed for each unit that got hit. ( a bit unfortunate if this is on an long range area attack). The -1 speed will be also applied but this one can be at least dissenchanted or removed in other ways.