Druids don't get a lot of non-elemental DPS spells, unfortunately. Ice Storm does bludgeoning dmg as well as cold, so it's semi-useful against blackbones; likewise Flame Strike is half-fire half-divine dmg. Splinterbolt & Spike Growth do piercing dmg: not helpful against skellies, but they can occasionally be useful. Salt Ray is Force dmg; the stun does nothing against undead, ofc. Word of Balance is great against CE/LE foes, but you won't get it until druid lvl 11; Sunburst SLA at lvl 12 is great against undead (and not much else).