D&D House Rules: Cleric Sacrifice

A player in my Masters of Mu homebrew campaign has shown an interest in his cleric performing many sacrifices and rituals for flavor.  I felt this was due a quick house-rule treatment, so I added this.  Our core rules set is Lamentations of the Flame Princess, however we augment that with other B/X retro-clone and AD&D material.  We use the silver piece standard.

Cleric Sacrifice

May be performed once/week. Cleric picks a spell level.  Cleric must pay 50sp per spell level in ritual accoutrements and find a fitting animal sacrifice of 1HD per spell level to receive one roll on the below table.  The ritual lasts 1d6 hours, during which time the cleric must not be interrupted

1 no response
2 Omen from deity
3 Vision from deity while sleeping
4 Vision from deity while awake
5-6 One of the above (roll d4) and extra spell slot of level above for the following day