Yeah Cutest and very squishly, tell me about it. Have to keep a Shadow Blade with me to spell the Ulti perfectly, Ulti and then Shadow Blade and enemies many times die around you like butter cut with hot knife.
In one match I was roaming with a carry and then 3 heroes attacked us, Carry dealt damage to them but then thought that its better to run and ran, I couldn't. So I activated the Ulti and Shadow Blade and by the time they came near me they were already dead, got a triple kill.
I really like the Ulti of Lich, specially as a support as it basically forces the group to split thus saving your carry and deals massive damage, so if you have a good carry getting attacked by group just fire away enemies, heal the Carry with Mekanasm and 2or 3 heroes are in your bag now.