Dont hate me on the formatting here.
Lich are very interesting class indeed. Their victory hinges on the golems you use and the timing with which you 'unleash' them.
The golems: Fire, Clay, Stone, Iron, Bone, Water, Diamond, Rune, Paper
*Paper and Rune golems are achievable with artifacts only.
Fire - damages entire room, even you
Clay - sticks opponent with mud pretty bad (great against melee classes like samurai/avenger/ninja)
Stone - Gives you a boost on armor
Iron - heals you pretty decently
Bone - puts up a wall (really only great against the bouncy avenger)
Water - you get to flee the room without fail
Diamond - it's supposed to stun your opponent pretty bad (heavy lag)
Rune - HUGE stat buffs to lich (usually a prefight thing)
Paper - forces opponent to remove all equipment
chant damage is your main middie against everybody
chant bless if you're not using rune golem
chant curse every opponent, every time
chaosmagic rarely works
powertransfer - useful after you unleash a water golem for a quick heal, try to get 2 in between combat
polarity - steals opponents mana, and gives you health - it's a weak effect - wouldn't recommend trying to rely on this
painwreck - a very situational power only useful vs combo classes as it adds a very little bit of lag.
Equipment strategy: I went full psyche with mine, dont regret it.
Fight strategy: The most important aspect of fighting for liches is which golem they use. Chant damage is your bread and butter.
That's the general strategy. Sometimes you'll be fighting AI that likes to dispel their debuffs.. at that point I unleash my golem, and continue chant damage