does the effect of this item mainly buff/debuff break rolls ???

it is a bound item, so you have to use it in the magic phase, correct? and since it only lasts until end of turn, and not 'until next magic phase', you can't benefit from it on animosity, stupidity, fear, or any other of the 900 leadership tests that orcs and goblins have to take???

is it me or is this item a rip off at 40 points?

the horn of urgok - 40 points
bound item, power level 5

when this horn is sounded, all friendly units receive +1 ld, and all enemy units receive -1 ld, until the end of the turn. roll d6 after use, roll 1 and take s5 hit w/no armor save