Unicows may be killed for their 100% drop rate of unicorn horns, which are commonly used for both Herblore and Summoning. These creatures may be created in the Tower of Life by placing a unicorn horn and cowhide on the north-western altar. Unicows have a combat level of level 82 and attack using magic. Lower levelled players may wish to equip armour strong to magic attacks, but food should not be necessary. With a Pack yak a small improvement in efficiency and a decrease in input cost can be gained.