Warlock/cleric is a very SP demanding build. All builds using two trees require farming but this one especially.
If you stick to cleric for helping yourself take bless, recovery division and the spells protecting from special status (cold, stun, etc).
For warlock you need the baby nuke (it's the only real attack of the warlock), vampire touch (cast it a lot to regain HP substracted from the monster), the razes (lower the physical or magical defense of the mob) and stuff like division, sleeping, etc... to lower the monsters defences. Warlocks gain their zerk back very easily so everytime that your zerk is full, use it. And in a party the warlock is there in first place to lower the mobs defense, not killing it. So keep casting spell after spell after spell. Start with razes and vampiric touch, than division, stun, sleep, etc.... It's very spectacular to look at all those visual warlock effects
