Ice Golem is the second core unit for Svara. Svara requires structures for almost everything and therefore Ice Golems are necessary for nearly all of her plans. In that sense they are extremely versatile as they help any plan or tactic you want to employ. On defense they can save Svara movements because they can be built on your side wherever they are needed, and on offense they bring other units into a forward position.
They are held back by Slow but Glacial Shift and Structural Shift both help compensate for that and even outside of that, kiting them is not really possible as they can summon units next to themselves to reach ranged attackers.
Ice Golems are a very safe investment for Svara because they are always useful, summoning all 4 of them is not an uncommon occurrence in games for Polar Dwarves.