ISA (Ice)
Germanic: Icz (Isa)
Gothic Eis
Norse: Íss
Anglo-Saxon: Is
Icelandic: Íss
Norwegian: Is
Isa is a rune of binding. It represents stealth and sneakiness and is used in operations where one wishes to proceed undetected; Iss bestows invisibility. In nature, ice creeps up on the land, quietly freezing and immobilizing everything in its path. The unaware fall victim to it. Magickally, Iss is a rune of binding and preventing action through hidden means. It can halt a plan and prevent something from developing. It is used to conceal and can render a victim unaware of impending personal disaster to where any actions attempted will be too late in coming. It is also used in preventing any action and can ruin planned activity. Isa freezes action and is the rune of cold, barren stillness and death. Isa is the exact opposite of Fehu. As Fehu is a rune of movement, Isa is a rune of binding.
Used in ritual against another, it brings barrenness, prevents prosperity, causes depression, and serves as an obstacle to action. Can be used to cause paralyzing fear or obsession and to prevent or stop movement, both that of growth and disintegration. On a more positive note, this rune is helpful in void meditation as it acts to still and also helpful in concentration, bringing calmness and guidance. Care needs to be taken as the rune can also make the user dull and/or obsessive. Isa works to calm hysteria, hyperactivity and restlessness. Often used in revenge spells and defense, it helps focus the will of the operator. Used with other runes, it acts to bind and shield the energies and keep them from interacting with each other.
If you know it's negative effects, it's easily to defend yourself against it. This is why I'm posting the effects of black magic.