When the storm comes, lightning will be of no help.
Whirling frostbite and dying flesh, boiling rage and smog and blood. Endless agony of hunger them both. The demons of ice and fire once tore the world apart without a host, infinite and hedonistic, and the only thing capable of stopping each one - the only thing capable of out-eating and out-competing each one was the other.
Olaichtyn's rage and hate was - and forever is - unstoppable, and it covers the pole of Aulik with deadly cold that cannot touch the rest of the world. The forests of his domain are unknowable, his eyes travel far, waiting to be his army again. His host will kill and conquer, and if it meets the eyes of the Host of T'akrin, they will fight until the death.
T'akrin, the hedonist, cares only for herself, and will take all for herself. Her shrine is barren and red, her people are tortured and bloody. She devours and fucks and burns all in her way. Her host will do the same, but at the same time, she delights in torturing her host for her amusement. Her people ritually cannibalize their enemies - her host may do the same if she desires. She cares not for Olaichtyn and sees him only as a hindrance, not a wartime enemy.
Yssc does nothing. The demon of lightning is a wildcard and should only be kept alive to keep the world from tearing itself apart, as the leylines will split the planet apart if all three die at once - whether in their host or corporeal.
Keep them apart. Keep them alive. Keep the storm from growing.